The Tor Browser: js/src/jit/LIR-Common.h@6474c204b198 (annotated)

js/src/jit/LIR-Common.h@6474c204b198 (annotated)

js/src/jit/LIR-Common.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef jit_LIR_Common_h
 #define jit_LIR_Common_h
 #include "jit/shared/Assembler-shared.h"
 // This file declares LIR instructions that are common to every platform.
 namespace js {
 namespace jit {
 class Range;
 template <size_t Temps, size_t ExtraUses = 0>
 class LBinaryMath : public LInstructionHelper<1, 2 + ExtraUses, Temps>
 {
   public:
     const LAllocation *lhs() {
         return this->getOperand(0);
     }
     const LAllocation *rhs() {
         return this->getOperand(1);
     }
 };
 // Simplifies register allocation since the first instruction of a block is
 // guaranteed to have no uses.
 class LLabel : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(Label)
 };
 class LNop : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(Nop)
 };
 // An LOsiPoint captures a snapshot after a call and ensures enough space to
 // patch in a call to the invalidation mechanism.
 //
 // Note: LSafepoints are 1:1 with LOsiPoints, so it holds a reference to the
 // corresponding LSafepoint to inform it of the LOsiPoint's masm offset when it
 // gets CG'd.
 class LOsiPoint : public LInstructionHelper<0, 0, 0>
 {
     LSafepoint *safepoint_;
   public:
     LOsiPoint(LSafepoint *safepoint, LSnapshot *snapshot)
       : safepoint_(safepoint)
     {
         JS_ASSERT(safepoint && snapshot);
         assignSnapshot(snapshot);
     }
     LSafepoint *associatedSafepoint() {
         return safepoint_;
     }
     LIR_HEADER(OsiPoint)
 };
 class LMove
 {
     LAllocation *from_;
     LAllocation *to_;
     LDefinition::Type type_;
   public:
     LMove(LAllocation *from, LAllocation *to, LDefinition::Type type)
       : from_(from),
         to_(to),
         type_(type)
     { }
     LAllocation *from() {
         return from_;
     }
     const LAllocation *from() const {
         return from_;
     }
     LAllocation *to() {
         return to_;
     }
     const LAllocation *to() const {
         return to_;
     }
     LDefinition::Type type() const {
         return type_;
     }
 };
 class LMoveGroup : public LInstructionHelper<0, 0, 0>
 {
     js::Vector<LMove, 2, IonAllocPolicy> moves_;
     LMoveGroup(TempAllocator &alloc)
       : moves_(alloc)
     { }
   public:
     LIR_HEADER(MoveGroup)
     static LMoveGroup *New(TempAllocator &alloc) {
         return new(alloc) LMoveGroup(alloc);
     }
     void printOperands(FILE *fp);
     // Add a move which takes place simultaneously with all others in the group.
     bool add(LAllocation *from, LAllocation *to, LDefinition::Type type);
     // Add a move which takes place after existing moves in the group.
     bool addAfter(LAllocation *from, LAllocation *to, LDefinition::Type type);
     size_t numMoves() const {
         return moves_.length();
     }
     const LMove &getMove(size_t i) const {
         return moves_[i];
     }
 };
 // Constant 32-bit integer.
 class LInteger : public LInstructionHelper<1, 0, 0>
 {
     int32_t i32_;
   public:
     LIR_HEADER(Integer)
     LInteger(int32_t i32)
       : i32_(i32)
     { }
     int32_t getValue() const {
         return i32_;
     }
 };
 // Constant pointer.
 class LPointer : public LInstructionHelper<1, 0, 0>
 {
   public:
     enum Kind {
         GC_THING,
         NON_GC_THING
     };
   private:
     void *ptr_;
     Kind kind_;
   public:
     LIR_HEADER(Pointer)
     LPointer(gc::Cell *ptr)
       : ptr_(ptr), kind_(GC_THING)
     { }
     LPointer(void *ptr, Kind kind)
       : ptr_(ptr), kind_(kind)
     { }
     void *ptr() const {
         return ptr_;
     }
     Kind kind() const {
         return kind_;
     }
     const char *extraName() const {
         return kind_ == GC_THING ? "GC_THING" : "NON_GC_THING";
     }
     gc::Cell *gcptr() const {
         JS_ASSERT(kind() == GC_THING);
         return (gc::Cell *) ptr_;
     }
 };
 // Constant double.
 class LDouble : public LInstructionHelper<1, 0, 0>
 {
     double d_;
   public:
     LIR_HEADER(Double);
     LDouble(double d) : d_(d)
     { }
     double getDouble() const {
         return d_;
     }
 };
 // Constant float32.
 class LFloat32 : public LInstructionHelper<1, 0, 0>
 {
     float f_;
   public:
     LIR_HEADER(Float32);
     LFloat32(float f)
       : f_(f)
     { }
     float getFloat() const {
         return f_;
     }
 };
 // A constant Value.
 class LValue : public LInstructionHelper<BOX_PIECES, 0, 0>
 {
     Value v_;
   public:
     LIR_HEADER(Value)
     LValue(const Value &v)
       : v_(v)
     { }
     Value value() const {
         return v_;
     }
 };
 // Clone an object literal such as we are not modifying the object contained in
 // the sources.
 class LCloneLiteral : public LCallInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(CloneLiteral)
     LCloneLiteral(const LAllocation &obj)
     {
         setOperand(0, obj);
     }
     const LAllocation *getObjectLiteral() {
         return getOperand(0);
     }
     MCloneLiteral *mir() const {
         return mir_->toCloneLiteral();
     }
 };
 // Formal argument for a function, returning a box. Formal arguments are
 // initially read from the stack.
 class LParameter : public LInstructionHelper<BOX_PIECES, 0, 0>
 {
   public:
     LIR_HEADER(Parameter)
 };
 // Stack offset for a word-sized immutable input value to a frame.
 class LCallee : public LInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(Callee)
 };
 // Base class for control instructions (goto, branch, etc.)
 template <size_t Succs, size_t Operands, size_t Temps>
 class LControlInstructionHelper : public LInstructionHelper<0, Operands, Temps> {
     mozilla::Array<MBasicBlock *, Succs> successors_;
   public:
     virtual size_t numSuccessors() const MOZ_FINAL MOZ_OVERRIDE { return Succs; }
     virtual MBasicBlock *getSuccessor(size_t i) const MOZ_FINAL MOZ_OVERRIDE {
         return successors_[i];
     }
     virtual void setSuccessor(size_t i, MBasicBlock *successor) MOZ_FINAL MOZ_OVERRIDE {
         successors_[i] = successor;
     }
 };
 // Jumps to the start of a basic block.
 class LGoto : public LControlInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(Goto)
     LGoto(MBasicBlock *block)
     {
          setSuccessor(0, block);
     }
     MBasicBlock *target() const {
         return getSuccessor(0);
     }
 };
 class LNewSlots : public LCallInstructionHelper<1, 0, 3>
 {
   public:
     LIR_HEADER(NewSlots)
     LNewSlots(const LDefinition &temp1, const LDefinition &temp2, const LDefinition &temp3) {
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
     MNewSlots *mir() const {
         return mir_->toNewSlots();
     }
 };
 class LNewArray : public LInstructionHelper<1, 0, 1>
 {
   public:
     LIR_HEADER(NewArray)
     LNewArray(const LDefinition &temp) {
         setTemp(0, temp);
     }
     const char *extraName() const {
         return mir()->shouldUseVM() ? "VMCall" : nullptr;
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MNewArray *mir() const {
         return mir_->toNewArray();
     }
 };
 class LNewObject : public LInstructionHelper<1, 0, 1>
 {
   public:
     LIR_HEADER(NewObject)
     LNewObject(const LDefinition &temp) {
         setTemp(0, temp);
     }
     const char *extraName() const {
         return mir()->shouldUseVM() ? "VMCall" : nullptr;
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MNewObject *mir() const {
         return mir_->toNewObject();
     }
 };
 class LNewPar : public LInstructionHelper<1, 1, 2>
 {
   public:
     LIR_HEADER(NewPar);
     LNewPar(const LAllocation &cx, const LDefinition &temp1, const LDefinition &temp2) {
         setOperand(0, cx);
         setTemp(0, temp1);
         setTemp(1, temp2);
     }
     MNewPar *mir() const {
         return mir_->toNewPar();
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LDefinition *getTemp0() {
         return getTemp(0);
     }
     const LDefinition *getTemp1() {
         return getTemp(1);
     }
 };
 class LNewDenseArrayPar : public LCallInstructionHelper<1, 2, 3>
 {
   public:
     LIR_HEADER(NewDenseArrayPar);
     LNewDenseArrayPar(const LAllocation &cx, const LAllocation &length,
                       const LDefinition &temp1, const LDefinition &temp2, const LDefinition &temp3)
     {
         setOperand(0, cx);
         setOperand(1, length);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     MNewDenseArrayPar *mir() const {
         return mir_->toNewDenseArrayPar();
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LAllocation *length() {
         return getOperand(1);
     }
     const LDefinition *getTemp0() {
         return getTemp(0);
     }
     const LDefinition *getTemp1() {
         return getTemp(1);
     }
     const LDefinition *getTemp2() {
         return getTemp(2);
     }
 };
 // Allocates a new DeclEnvObject.
 //
 // This instruction generates two possible instruction sets:
 //   (1) An inline allocation of the call object is attempted.
 //   (2) Otherwise, a callVM create a new object.
 //
 class LNewDeclEnvObject : public LInstructionHelper<1, 0, 1>
 {
   public:
     LIR_HEADER(NewDeclEnvObject);
     LNewDeclEnvObject(const LDefinition &temp) {
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MNewDeclEnvObject *mir() const {
         return mir_->toNewDeclEnvObject();
     }
 };
 // Allocates a new CallObject. The inputs are:
 //      slots: either a reg representing a HeapSlot *, or a placeholder
 //             meaning that no slots pointer is needed.
 //
 // This instruction generates two possible instruction sets:
 //   (1) If the call object is extensible, this is a callVM to create the
 //       call object.
 //   (2) Otherwise, an inline allocation of the call object is attempted.
 //
 class LNewCallObject : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(NewCallObject)
     LNewCallObject(const LAllocation &slots, const LDefinition &temp) {
         setOperand(0, slots);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LAllocation *slots() {
         return getOperand(0);
     }
     MNewCallObject *mir() const {
         return mir_->toNewCallObject();
     }
 };
 // Allocates a new CallObject with singleton type through an out-of-line VM
 // call. The inputs are:
 //      slots: either a reg representing a HeapSlot *, or a placeholder
 //             meaning that no slots pointer is needed.
 //
 class LNewSingletonCallObject : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NewSingletonCallObject)
     LNewSingletonCallObject(const LAllocation &slots) {
         setOperand(0, slots);
     }
     const LAllocation *slots() {
         return getOperand(0);
     }
     MNewCallObjectBase * mir() const {
         MOZ_ASSERT(mir_->isNewCallObject() || mir_->isNewRunOnceCallObject());
         return static_cast<MNewCallObjectBase *>(mir_);
     }
 };
 class LNewCallObjectPar : public LInstructionHelper<1, 2, 2>
 {
     LNewCallObjectPar(const LAllocation &cx, const LAllocation &slots,
                       const LDefinition &temp1, const LDefinition &temp2)
     {
         setOperand(0, cx);
         setOperand(1, slots);
         setTemp(0, temp1);
         setTemp(1, temp2);
     }
 public:
     LIR_HEADER(NewCallObjectPar);
     static LNewCallObjectPar *NewWithSlots(TempAllocator &alloc,
                                            const LAllocation &cx, const LAllocation &slots,
                                            const LDefinition &temp1, const LDefinition &temp2)
     {
         return new(alloc) LNewCallObjectPar(cx, slots, temp1, temp2);
     }
     static LNewCallObjectPar *NewSansSlots(TempAllocator &alloc,
                                            const LAllocation &cx,
                                            const LDefinition &temp1, const LDefinition &temp2)
     {
         LAllocation slots = LConstantIndex::Bogus();
         return new(alloc) LNewCallObjectPar(cx, slots, temp1, temp2);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LAllocation *slots() {
         return getOperand(1);
     }
     const bool hasDynamicSlots() {
         // TO INVESTIGATE: Felix tried using isRegister() method here,
         // but for useFixed(_, CallTempN), isRegister() is false (and
         // isUse() is true).  So for now ignore that and try to match
         // the LConstantIndex::Bogus() generated above instead.
         return slots() && ! slots()->isConstant();
     }
     const MNewCallObjectPar *mir() const {
         return mir_->toNewCallObjectPar();
     }
     const LDefinition *getTemp0() {
         return getTemp(0);
     }
     const LDefinition *getTemp1() {
         return getTemp(1);
     }
 };
 class LNewDerivedTypedObject : public LCallInstructionHelper<1, 3, 0>
 {
   public:
     LIR_HEADER(NewDerivedTypedObject);
     LNewDerivedTypedObject(const LAllocation &type,
                            const LAllocation &owner,
                            const LAllocation &offset) {
         setOperand(0, type);
         setOperand(1, owner);
         setOperand(2, offset);
     }
     const LAllocation *type() {
         return getOperand(0);
     }
     const LAllocation *owner() {
         return getOperand(1);
     }
     const LAllocation *offset() {
         return getOperand(2);
     }
 };
 class LNewStringObject : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(NewStringObject)
     LNewStringObject(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LAllocation *input() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MNewStringObject *mir() const {
         return mir_->toNewStringObject();
     }
 };
 class LAbortPar : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(AbortPar);
 };
 class LInitElem : public LCallInstructionHelper<0, 1 + 2*BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(InitElem)
     LInitElem(const LAllocation &object) {
         setOperand(0, object);
     }
     static const size_t IdIndex = 1;
     static const size_t ValueIndex = 1 + BOX_PIECES;
     const LAllocation *getObject() {
         return getOperand(0);
     }
     MInitElem *mir() const {
         return mir_->toInitElem();
     }
 };
 class LInitElemGetterSetter : public LCallInstructionHelper<0, 2 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(InitElemGetterSetter)
     LInitElemGetterSetter(const LAllocation &object, const LAllocation &value) {
         setOperand(0, object);
         setOperand(1, value);
     }
     static const size_t IdIndex = 2;
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     MInitElemGetterSetter *mir() const {
         return mir_->toInitElemGetterSetter();
     }
 };
 // Takes in an Object and a Value.
 class LMutateProto : public LCallInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(MutateProto)
     LMutateProto(const LAllocation &object) {
         setOperand(0, object);
     }
     static const size_t ValueIndex = 1;
     const LAllocation *getObject() {
         return getOperand(0);
     }
     const LAllocation *getValue() {
         return getOperand(1);
     }
 };
 // Takes in an Object and a Value.
 class LInitProp : public LCallInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(InitProp)
     LInitProp(const LAllocation &object) {
         setOperand(0, object);
     }
     static const size_t ValueIndex = 1;
     const LAllocation *getObject() {
         return getOperand(0);
     }
     const LAllocation *getValue() {
         return getOperand(1);
     }
     MInitProp *mir() const {
         return mir_->toInitProp();
     }
 };
 class LInitPropGetterSetter : public LCallInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(InitPropGetterSetter)
     LInitPropGetterSetter(const LAllocation &object, const LAllocation &value) {
         setOperand(0, object);
         setOperand(1, value);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     MInitPropGetterSetter *mir() const {
         return mir_->toInitPropGetterSetter();
     }
 };
 class LCheckOverRecursed : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(CheckOverRecursed)
     LCheckOverRecursed()
     { }
 };
 class LCheckOverRecursedPar : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(CheckOverRecursedPar);
     LCheckOverRecursedPar(const LAllocation &cx, const LDefinition &tempReg) {
         setOperand(0, cx);
         setTemp(0, tempReg);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LDefinition *getTempReg() {
         return getTemp(0);
     }
 };
 // Alternative to LInterruptCheck which does not emit an explicit check of the
 // interrupt flag but relies on the loop backedge being patched via a signal
 // handler.
 class LInterruptCheckImplicit : public LInstructionHelper<0, 0, 0>
 {
     Label *oolEntry_;
   public:
     LIR_HEADER(InterruptCheckImplicit)
     LInterruptCheckImplicit()
       : oolEntry_(nullptr)
     {}
     Label *oolEntry() {
         return oolEntry_;
     }
     void setOolEntry(Label *oolEntry) {
         oolEntry_ = oolEntry;
     }
 };
 class LInterruptCheckPar : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(InterruptCheckPar);
     LInterruptCheckPar(const LAllocation &cx, const LDefinition &tempReg) {
         setOperand(0, cx);
         setTemp(0, tempReg);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LDefinition *getTempReg() {
         return getTemp(0);
     }
 };
 class LDefVar : public LCallInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(DefVar)
     LDefVar(const LAllocation &scopeChain)
     {
         setOperand(0, scopeChain);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     MDefVar *mir() const {
         return mir_->toDefVar();
     }
 };
 class LDefFun : public LCallInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(DefFun)
     LDefFun(const LAllocation &scopeChain)
     {
         setOperand(0, scopeChain);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     MDefFun *mir() const {
         return mir_->toDefFun();
     }
 };
 class LTypeOfV : public LInstructionHelper<1, BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(TypeOfV)
     LTypeOfV(const LDefinition &tempToUnbox) {
         setTemp(0, tempToUnbox);
     }
     static const size_t Input = 0;
     const LDefinition *tempToUnbox() {
         return getTemp(0);
     }
     MTypeOf *mir() const {
         return mir_->toTypeOf();
     }
 };
 class LToIdV : public LInstructionHelper<BOX_PIECES, 2 * BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(ToIdV)
     LToIdV(const LDefinition &temp)
     {
         setTemp(0, temp);
     }
     static const size_t Object = 0;
     static const size_t Index = BOX_PIECES;
     MToId *mir() const {
         return mir_->toToId();
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
 };
 // Allocate an object for |new| on the caller-side,
 // when there is no templateObject or prototype known
 class LCreateThis : public LCallInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(CreateThis)
     LCreateThis(const LAllocation &callee)
     {
         setOperand(0, callee);
     }
     const LAllocation *getCallee() {
         return getOperand(0);
     }
     MCreateThis *mir() const {
         return mir_->toCreateThis();
     }
 };
 // Allocate an object for |new| on the caller-side,
 // when the prototype is known.
 class LCreateThisWithProto : public LCallInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(CreateThisWithProto)
     LCreateThisWithProto(const LAllocation &callee, const LAllocation &prototype)
     {
         setOperand(0, callee);
         setOperand(1, prototype);
     }
     const LAllocation *getCallee() {
         return getOperand(0);
     }
     const LAllocation *getPrototype() {
         return getOperand(1);
     }
     MCreateThis *mir() const {
         return mir_->toCreateThis();
     }
 };
 // Allocate an object for |new| on the caller-side.
 // Always performs object initialization with a fast path.
 class LCreateThisWithTemplate : public LInstructionHelper<1, 0, 1>
 {
   public:
     LIR_HEADER(CreateThisWithTemplate)
     LCreateThisWithTemplate(const LDefinition &temp) {
         setTemp(0, temp);
     }
     MCreateThisWithTemplate *mir() const {
         return mir_->toCreateThisWithTemplate();
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Allocate a new arguments object for the frame.
 class LCreateArgumentsObject : public LCallInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(CreateArgumentsObject)
     LCreateArgumentsObject(const LAllocation &callObj, const LDefinition &temp)
     {
         setOperand(0, callObj);
         setTemp(0, temp);
     }
     const LAllocation *getCallObject() {
         return getOperand(0);
     }
     MCreateArgumentsObject *mir() const {
         return mir_->toCreateArgumentsObject();
     }
 };
 // Get argument from arguments object.
 class LGetArgumentsObjectArg : public LInstructionHelper<BOX_PIECES, 1, 1>
 {
   public:
     LIR_HEADER(GetArgumentsObjectArg)
     LGetArgumentsObjectArg(const LAllocation &argsObj, const LDefinition &temp)
     {
         setOperand(0, argsObj);
         setTemp(0, temp);
     }
     const LAllocation *getArgsObject() {
         return getOperand(0);
     }
     MGetArgumentsObjectArg *mir() const {
         return mir_->toGetArgumentsObjectArg();
     }
 };
 // Set argument on arguments object.
 class LSetArgumentsObjectArg : public LInstructionHelper<0, 1 + BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(SetArgumentsObjectArg)
     LSetArgumentsObjectArg(const LAllocation &argsObj, const LDefinition &temp)
     {
         setOperand(0, argsObj);
         setTemp(0, temp);
     }
     const LAllocation *getArgsObject() {
         return getOperand(0);
     }
     MSetArgumentsObjectArg *mir() const {
         return mir_->toSetArgumentsObjectArg();
     }
     static const size_t ValueIndex = 1;
 };
 // If the Value is an Object, return unbox(Value).
 // Otherwise, return the other Object.
 class LReturnFromCtor : public LInstructionHelper<1, BOX_PIECES + 1, 0>
 {
   public:
     LIR_HEADER(ReturnFromCtor)
     LReturnFromCtor(const LAllocation &object)
     {
         // Value set by useBox() during lowering.
         setOperand(LReturnFromCtor::ObjectIndex, object);
     }
     const LAllocation *getObject() {
         return getOperand(LReturnFromCtor::ObjectIndex);
     }
     static const size_t ValueIndex = 0;
     static const size_t ObjectIndex = BOX_PIECES;
 };
 class LComputeThis : public LInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(ComputeThis)
     static const size_t ValueIndex = 0;
     const LDefinition *output() {
         return getDef(0);
     }
     MComputeThis *mir() const {
         return mir_->toComputeThis();
     }
 };
 class LLoadArrowThis : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LLoadArrowThis(const LAllocation &callee) {
         setOperand(0, callee);
     }
     LIR_HEADER(LoadArrowThis)
     const LAllocation *callee() {
         return getOperand(0);
     }
 };
 // Writes a typed argument for a function call to the frame's argument vector.
 class LStackArgT : public LInstructionHelper<0, 1, 0>
 {
     uint32_t argslot_; // Index into frame-scope argument vector.
     MIRType type_;
   public:
     LIR_HEADER(StackArgT)
     LStackArgT(uint32_t argslot, MIRType type, const LAllocation &arg)
       : argslot_(argslot),
         type_(type)
     {
         setOperand(0, arg);
     }
     uint32_t argslot() const {
         return argslot_;
     }
     MIRType type() const {
         return type_;
     }
     const LAllocation *getArgument() {
         return getOperand(0);
     }
 };
 // Writes an untyped argument for a function call to the frame's argument vector.
 class LStackArgV : public LInstructionHelper<0, BOX_PIECES, 0>
 {
     uint32_t argslot_; // Index into frame-scope argument vector.
   public:
     LIR_HEADER(StackArgV)
     LStackArgV(uint32_t argslot)
       : argslot_(argslot)
     { }
     uint32_t argslot() const {
         return argslot_;
     }
 };
 // Common code for LIR descended from MCall.
 template <size_t Defs, size_t Operands, size_t Temps>
 class LJSCallInstructionHelper : public LCallInstructionHelper<Defs, Operands, Temps>
 {
   public:
     uint32_t argslot() const {
         return mir()->numStackArgs();
     }
     MCall *mir() const {
         return this->mir_->toCall();
     }
     bool hasSingleTarget() const {
         return getSingleTarget() != nullptr;
     }
     JSFunction *getSingleTarget() const {
         return mir()->getSingleTarget();
     }
     // The number of stack arguments is the max between the number of formal
     // arguments and the number of actual arguments. The number of stack
     // argument includes the |undefined| padding added in case of underflow.
     // Does not include |this|.
     uint32_t numStackArgs() const {
         JS_ASSERT(mir()->numStackArgs() >= 1);
         return mir()->numStackArgs() - 1; // |this| is not a formal argument.
     }
     // Does not include |this|.
     uint32_t numActualArgs() const {
         return mir()->numActualArgs();
     }
 };
 // Generates a polymorphic callsite, wherein the function being called is
 // unknown and anticipated to vary.
 class LCallGeneric : public LJSCallInstructionHelper<BOX_PIECES, 1, 2>
 {
   public:
     LIR_HEADER(CallGeneric)
     LCallGeneric(const LAllocation &func, const LDefinition &nargsreg,
                  const LDefinition &tmpobjreg)
     {
         setOperand(0, func);
         setTemp(0, nargsreg);
         setTemp(1, tmpobjreg);
     }
     const LAllocation *getFunction() {
         return getOperand(0);
     }
     const LDefinition *getNargsReg() {
         return getTemp(0);
     }
     const LDefinition *getTempObject() {
         return getTemp(1);
     }
 };
 // Generates a hardcoded callsite for a known, non-native target.
 class LCallKnown : public LJSCallInstructionHelper<BOX_PIECES, 1, 1>
 {
   public:
     LIR_HEADER(CallKnown)
     LCallKnown(const LAllocation &func, const LDefinition &tmpobjreg)
     {
         setOperand(0, func);
         setTemp(0, tmpobjreg);
     }
     const LAllocation *getFunction() {
         return getOperand(0);
     }
     const LDefinition *getTempObject() {
         return getTemp(0);
     }
 };
 // Generates a hardcoded callsite for a known, native target.
 class LCallNative : public LJSCallInstructionHelper<BOX_PIECES, 0, 4>
 {
   public:
     LIR_HEADER(CallNative)
     LCallNative(const LDefinition &argContext, const LDefinition &argUintN,
                 const LDefinition &argVp, const LDefinition &tmpreg)
     {
         // Registers used for callWithABI().
         setTemp(0, argContext);
         setTemp(1, argUintN);
         setTemp(2, argVp);
         // Temporary registers.
         setTemp(3, tmpreg);
     }
     const LDefinition *getArgContextReg() {
         return getTemp(0);
     }
     const LDefinition *getArgUintNReg() {
         return getTemp(1);
     }
     const LDefinition *getArgVpReg() {
         return getTemp(2);
     }
     const LDefinition *getTempReg() {
         return getTemp(3);
     }
 };
 // Generates a hardcoded callsite for a known, DOM-native target.
 class LCallDOMNative : public LJSCallInstructionHelper<BOX_PIECES, 0, 4>
 {
   public:
     LIR_HEADER(CallDOMNative)
     LCallDOMNative(const LDefinition &argJSContext, const LDefinition &argObj,
                    const LDefinition &argPrivate, const LDefinition &argArgs)
     {
         setTemp(0, argJSContext);
         setTemp(1, argObj);
         setTemp(2, argPrivate);
         setTemp(3, argArgs);
     }
     const LDefinition *getArgJSContext() {
         return getTemp(0);
     }
     const LDefinition *getArgObj() {
         return getTemp(1);
     }
     const LDefinition *getArgPrivate() {
         return getTemp(2);
     }
     const LDefinition *getArgArgs() {
         return getTemp(3);
     }
 };
 class LBail : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(Bail)
 };
 template <size_t defs, size_t ops>
 class LDOMPropertyInstructionHelper : public LCallInstructionHelper<defs, 1 + ops, 3>
 {
   protected:
     LDOMPropertyInstructionHelper(const LDefinition &JSContextReg, const LAllocation &ObjectReg,
                                   const LDefinition &PrivReg, const LDefinition &ValueReg)
     {
         this->setOperand(0, ObjectReg);
         this->setTemp(0, JSContextReg);
         this->setTemp(1, PrivReg);
         this->setTemp(2, ValueReg);
     }
   public:
     const LDefinition *getJSContextReg() {
         return this->getTemp(0);
     }
     const LAllocation *getObjectReg() {
         return this->getOperand(0);
     }
     const LDefinition *getPrivReg() {
         return this->getTemp(1);
     }
     const LDefinition *getValueReg() {
         return this->getTemp(2);
     }
 };
 class LGetDOMProperty : public LDOMPropertyInstructionHelper<BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(GetDOMProperty)
     LGetDOMProperty(const LDefinition &JSContextReg, const LAllocation &ObjectReg,
                     const LDefinition &PrivReg, const LDefinition &ValueReg)
       : LDOMPropertyInstructionHelper<BOX_PIECES, 0>(JSContextReg, ObjectReg,
                                                      PrivReg, ValueReg)
     { }
     MGetDOMProperty *mir() const {
         return mir_->toGetDOMProperty();
     }
 };
 class LGetDOMMember : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(GetDOMMember);
     LGetDOMMember(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     MGetDOMMember *mir() const {
         return mir_->toGetDOMMember();
     }
 };
 class LSetDOMProperty : public LDOMPropertyInstructionHelper<0, BOX_PIECES>
 {
   public:
     LIR_HEADER(SetDOMProperty)
     LSetDOMProperty(const LDefinition &JSContextReg, const LAllocation &ObjectReg,
                     const LDefinition &PrivReg, const LDefinition &ValueReg)
       : LDOMPropertyInstructionHelper<0, BOX_PIECES>(JSContextReg, ObjectReg,
                                                      PrivReg, ValueReg)
     { }
     static const size_t Value = 1;
     MSetDOMProperty *mir() const {
         return mir_->toSetDOMProperty();
     }
 };
 // Generates a polymorphic callsite, wherein the function being called is
 // unknown and anticipated to vary.
 class LApplyArgsGeneric : public LCallInstructionHelper<BOX_PIECES, BOX_PIECES + 2, 2>
 {
   public:
     LIR_HEADER(ApplyArgsGeneric)
     LApplyArgsGeneric(const LAllocation &func, const LAllocation &argc,
                       const LDefinition &tmpobjreg, const LDefinition &tmpcopy)
     {
         setOperand(0, func);
         setOperand(1, argc);
         setTemp(0, tmpobjreg);
         setTemp(1, tmpcopy);
     }
     MApplyArgs *mir() const {
         return mir_->toApplyArgs();
     }
     bool hasSingleTarget() const {
         return getSingleTarget() != nullptr;
     }
     JSFunction *getSingleTarget() const {
         return mir()->getSingleTarget();
     }
     const LAllocation *getFunction() {
         return getOperand(0);
     }
     const LAllocation *getArgc() {
         return getOperand(1);
     }
     static const size_t ThisIndex = 2;
     const LDefinition *getTempObject() {
         return getTemp(0);
     }
     const LDefinition *getTempCopy() {
         return getTemp(1);
     }
 };
 class LArraySplice : public LCallInstructionHelper<0, 3, 0>
 {
   public:
     LIR_HEADER(ArraySplice)
     LArraySplice(const LAllocation &object, const LAllocation &start,
                  const LAllocation &deleteCount)
     {
         setOperand(0, object);
         setOperand(1, start);
         setOperand(2, deleteCount);
     }
     MArraySplice *mir() const {
         return mir_->toArraySplice();
     }
     const LAllocation *getObject() {
         return getOperand(0);
     }
     const LAllocation *getStart() {
         return getOperand(1);
     }
     const LAllocation *getDeleteCount() {
         return getOperand(2);
     }
 };
 class LGetDynamicName : public LCallInstructionHelper<BOX_PIECES, 2, 3>
 {
   public:
     LIR_HEADER(GetDynamicName)
     LGetDynamicName(const LAllocation &scopeChain, const LAllocation &name,
                     const LDefinition &temp1, const LDefinition &temp2, const LDefinition &temp3)
     {
         setOperand(0, scopeChain);
         setOperand(1, name);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     MGetDynamicName *mir() const {
         return mir_->toGetDynamicName();
     }
     const LAllocation *getScopeChain() {
         return getOperand(0);
     }
     const LAllocation *getName() {
         return getOperand(1);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
 };
 class LFilterArgumentsOrEvalS : public LCallInstructionHelper<0, 1, 2>
 {
   public:
     LIR_HEADER(FilterArgumentsOrEvalS)
     LFilterArgumentsOrEvalS(const LAllocation &string, const LDefinition &temp1,
                             const LDefinition &temp2)
     {
         setOperand(0, string);
         setTemp(0, temp1);
         setTemp(1, temp2);
     }
     MFilterArgumentsOrEval *mir() const {
         return mir_->toFilterArgumentsOrEval();
     }
     const LAllocation *getString() {
         return getOperand(0);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
 };
 class LFilterArgumentsOrEvalV : public LCallInstructionHelper<0, BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(FilterArgumentsOrEvalV)
     LFilterArgumentsOrEvalV(const LDefinition &temp1, const LDefinition &temp2,
                             const LDefinition &temp3)
     {
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     static const size_t Input = 0;
     MFilterArgumentsOrEval *mir() const {
         return mir_->toFilterArgumentsOrEval();
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
 };
 class LCallDirectEvalS : public LCallInstructionHelper<BOX_PIECES, 2 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallDirectEvalS)
     LCallDirectEvalS(const LAllocation &scopeChain, const LAllocation &string)
     {
         setOperand(0, scopeChain);
         setOperand(1, string);
     }
     static const size_t ThisValue = 2;
     MCallDirectEval *mir() const {
         return mir_->toCallDirectEval();
     }
     const LAllocation *getScopeChain() {
         return getOperand(0);
     }
     const LAllocation *getString() {
         return getOperand(1);
     }
 };
 class LCallDirectEvalV : public LCallInstructionHelper<BOX_PIECES, 1 + (2 * BOX_PIECES), 0>
 {
   public:
     LIR_HEADER(CallDirectEvalV)
     LCallDirectEvalV(const LAllocation &scopeChain)
     {
         setOperand(0, scopeChain);
     }
     static const size_t Argument = 1;
     static const size_t ThisValue = 1 + BOX_PIECES;
     MCallDirectEval *mir() const {
         return mir_->toCallDirectEval();
     }
     const LAllocation *getScopeChain() {
         return getOperand(0);
     }
 };
 // Takes in either an integer or boolean input and tests it for truthiness.
 class LTestIAndBranch : public LControlInstructionHelper<2, 1, 0>
 {
   public:
     LIR_HEADER(TestIAndBranch)
     LTestIAndBranch(const LAllocation &in, MBasicBlock *ifTrue, MBasicBlock *ifFalse)
     {
         setOperand(0, in);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
 };
 // Takes in either an integer or boolean input and tests it for truthiness.
 class LTestDAndBranch : public LControlInstructionHelper<2, 1, 0>
 {
   public:
     LIR_HEADER(TestDAndBranch)
     LTestDAndBranch(const LAllocation &in, MBasicBlock *ifTrue, MBasicBlock *ifFalse)
     {
         setOperand(0, in);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
 };
 // Takes in either an integer or boolean input and tests it for truthiness.
 class LTestFAndBranch : public LControlInstructionHelper<2, 1, 0>
 {
   public:
     LIR_HEADER(TestFAndBranch)
     LTestFAndBranch(const LAllocation &in, MBasicBlock *ifTrue, MBasicBlock *ifFalse)
     {
         setOperand(0, in);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
 };
 // Takes an object and tests it for truthiness.  An object is falsy iff it
 // emulates |undefined|; see js::EmulatesUndefined.
 class LTestOAndBranch : public LControlInstructionHelper<2, 1, 1>
 {
   public:
     LIR_HEADER(TestOAndBranch)
     LTestOAndBranch(const LAllocation &input, MBasicBlock *ifTruthy, MBasicBlock *ifFalsy,
                     const LDefinition &temp)
     {
         setOperand(0, input);
         setSuccessor(0, ifTruthy);
         setSuccessor(1, ifFalsy);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MBasicBlock *ifTruthy() {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalsy() {
         return getSuccessor(1);
     }
     MTest *mir() {
         return mir_->toTest();
     }
 };
 // Takes in a boxed value and tests it for truthiness.
 class LTestVAndBranch : public LControlInstructionHelper<2, BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(TestVAndBranch)
     LTestVAndBranch(MBasicBlock *ifTruthy, MBasicBlock *ifFalsy, const LDefinition &temp0,
                     const LDefinition &temp1, const LDefinition &temp2)
     {
         setSuccessor(0, ifTruthy);
         setSuccessor(1, ifFalsy);
         setTemp(0, temp0);
         setTemp(1, temp1);
         setTemp(2, temp2);
     }
     const char *extraName() const {
         return mir()->operandMightEmulateUndefined() ? "MightEmulateUndefined" : nullptr;
     }
     static const size_t Input = 0;
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
     const LDefinition *temp1() {
         return getTemp(1);
     }
     const LDefinition *temp2() {
         return getTemp(2);
     }
     MBasicBlock *ifTruthy() {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalsy() {
         return getSuccessor(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
 };
 // Dispatches control flow to a successor based on incoming JSFunction*.
 // Used to implemenent polymorphic inlining.
 class LFunctionDispatch : public LInstructionHelper<0, 1, 0>
 {
     // Dispatch is performed based on a function -> block map
     // stored in the MIR.
   public:
     LIR_HEADER(FunctionDispatch);
     LFunctionDispatch(const LAllocation &in) {
         setOperand(0, in);
     }
     MFunctionDispatch *mir() {
         return mir_->toFunctionDispatch();
     }
 };
 class LTypeObjectDispatch : public LInstructionHelper<0, 1, 1>
 {
     // Dispatch is performed based on a TypeObject -> block
     // map inferred by the MIR.
   public:
     LIR_HEADER(TypeObjectDispatch);
     LTypeObjectDispatch(const LAllocation &in, const LDefinition &temp) {
         setOperand(0, in);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MTypeObjectDispatch *mir() {
         return mir_->toTypeObjectDispatch();
     }
 };
 // Compares two integral values of the same JS type, either integer or object.
 // For objects, both operands are in registers.
 class LCompare : public LInstructionHelper<1, 2, 0>
 {
     JSOp jsop_;
   public:
     LIR_HEADER(Compare)
     LCompare(JSOp jsop, const LAllocation &left, const LAllocation &right)
       : jsop_(jsop)
     {
         setOperand(0, left);
         setOperand(1, right);
     }
     JSOp jsop() const {
         return jsop_;
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
 };
 // Compares two integral values of the same JS type, either integer or object.
 // For objects, both operands are in registers.
 class LCompareAndBranch : public LControlInstructionHelper<2, 2, 0>
 {
     MCompare *cmpMir_;
     JSOp jsop_;
   public:
     LIR_HEADER(CompareAndBranch)
     LCompareAndBranch(MCompare *cmpMir, JSOp jsop,
                       const LAllocation &left, const LAllocation &right,
                       MBasicBlock *ifTrue, MBasicBlock *ifFalse)
       : cmpMir_(cmpMir), jsop_(jsop)
     {
         setOperand(0, left);
         setOperand(1, right);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     JSOp jsop() const {
         return jsop_;
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
 };
 class LCompareD : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(CompareD)
     LCompareD(const LAllocation &left, const LAllocation &right) {
         setOperand(0, left);
         setOperand(1, right);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 class LCompareF : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(CompareF)
     LCompareF(const LAllocation &left, const LAllocation &right) {
         setOperand(0, left);
         setOperand(1, right);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 class LCompareDAndBranch : public LControlInstructionHelper<2, 2, 0>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(CompareDAndBranch)
     LCompareDAndBranch(MCompare *cmpMir, const LAllocation &left, const LAllocation &right,
                        MBasicBlock *ifTrue, MBasicBlock *ifFalse)
       : cmpMir_(cmpMir)
     {
         setOperand(0, left);
         setOperand(1, right);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
 };
 class LCompareFAndBranch : public LControlInstructionHelper<2, 2, 0>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(CompareFAndBranch)
     LCompareFAndBranch(MCompare *cmpMir, const LAllocation &left, const LAllocation &right,
                        MBasicBlock *ifTrue, MBasicBlock *ifFalse)
       : cmpMir_(cmpMir)
     {
         setOperand(0, left);
         setOperand(1, right);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
 };
 class LCompareS : public LInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(CompareS)
     LCompareS(const LAllocation &left, const LAllocation &right,
               const LDefinition &temp) {
         setOperand(0, left);
         setOperand(1, right);
         setTemp(0, temp);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 // strict-equality between value and string.
 class LCompareStrictS : public LInstructionHelper<1, BOX_PIECES + 1, 2>
 {
   public:
     LIR_HEADER(CompareStrictS)
     LCompareStrictS(const LAllocation &rhs, const LDefinition &temp0,
                     const LDefinition &temp1) {
         setOperand(BOX_PIECES, rhs);
         setTemp(0, temp0);
         setTemp(1, temp1);
     }
     static const size_t Lhs = 0;
     const LAllocation *right() {
         return getOperand(BOX_PIECES);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *tempToUnbox() {
         return getTemp(1);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 // Used for strict-equality comparisons where one side is a boolean
 // and the other is a value. Note that CompareI is used to compare
 // two booleans.
 class LCompareB : public LInstructionHelper<1, BOX_PIECES + 1, 0>
 {
   public:
     LIR_HEADER(CompareB)
     LCompareB(const LAllocation &rhs) {
         setOperand(BOX_PIECES, rhs);
     }
     static const size_t Lhs = 0;
     const LAllocation *rhs() {
         return getOperand(BOX_PIECES);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 class LCompareBAndBranch : public LControlInstructionHelper<2, BOX_PIECES + 1, 0>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(CompareBAndBranch)
     LCompareBAndBranch(MCompare *cmpMir, const LAllocation &rhs,
                        MBasicBlock *ifTrue, MBasicBlock *ifFalse)
       : cmpMir_(cmpMir)
     {
         setOperand(BOX_PIECES, rhs);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     static const size_t Lhs = 0;
     const LAllocation *rhs() {
         return getOperand(BOX_PIECES);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
 };
 class LCompareV : public LInstructionHelper<1, 2 * BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CompareV)
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
     MCompare *mir() const {
         return mir_->toCompare();
     }
 };
 class LCompareVAndBranch : public LControlInstructionHelper<2, 2 * BOX_PIECES, 0>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(CompareVAndBranch)
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
     LCompareVAndBranch(MCompare *cmpMir, MBasicBlock *ifTrue, MBasicBlock *ifFalse)
       : cmpMir_(cmpMir)
     {
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
 };
 class LCompareVM : public LCallInstructionHelper<1, 2 * BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CompareVM)
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
     MCompare *mir() const {
         return mir_->toCompare();
     }
 };
 class LBitAndAndBranch : public LControlInstructionHelper<2, 2, 0>
 {
   public:
     LIR_HEADER(BitAndAndBranch)
     LBitAndAndBranch(MBasicBlock *ifTrue, MBasicBlock *ifFalse)
     {
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     const LAllocation *left() {
         return getOperand(0);
     }
     const LAllocation *right() {
         return getOperand(1);
     }
 };
 class LIsNullOrLikeUndefined : public LInstructionHelper<1, BOX_PIECES, 2>
 {
   public:
     LIR_HEADER(IsNullOrLikeUndefined)
     LIsNullOrLikeUndefined(const LDefinition &temp, const LDefinition &tempToUnbox)
     {
         setTemp(0, temp);
         setTemp(1, tempToUnbox);
     }
     static const size_t Value = 0;
     MCompare *mir() {
         return mir_->toCompare();
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *tempToUnbox() {
         return getTemp(1);
     }
 };
 class LIsNullOrLikeUndefinedAndBranch : public LControlInstructionHelper<2, BOX_PIECES, 2>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(IsNullOrLikeUndefinedAndBranch)
     LIsNullOrLikeUndefinedAndBranch(MCompare *cmpMir, MBasicBlock *ifTrue, MBasicBlock *ifFalse,
                                     const LDefinition &temp, const LDefinition &tempToUnbox)
       : cmpMir_(cmpMir)
     {
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
         setTemp(0, temp);
         setTemp(1, tempToUnbox);
     }
     static const size_t Value = 0;
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *tempToUnbox() {
         return getTemp(1);
     }
 };
 // Takes an object and tests whether it emulates |undefined|, as determined by
 // the JSCLASS_EMULATES_UNDEFINED class flag on unwrapped objects.  See also
 // js::EmulatesUndefined.
 class LEmulatesUndefined : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(EmulatesUndefined)
     LEmulatesUndefined(const LAllocation &input)
     {
         setOperand(0, input);
     }
     MCompare *mir() {
         return mir_->toCompare();
     }
 };
 class LEmulatesUndefinedAndBranch : public LControlInstructionHelper<2, 1, 1>
 {
     MCompare *cmpMir_;
   public:
     LIR_HEADER(EmulatesUndefinedAndBranch)
     LEmulatesUndefinedAndBranch(MCompare *cmpMir, const LAllocation &input,
                                 MBasicBlock *ifTrue, MBasicBlock *ifFalse,
                                 const LDefinition &temp)
       : cmpMir_(cmpMir)
     {
         setOperand(0, input);
         setSuccessor(0, ifTrue);
         setSuccessor(1, ifFalse);
         setTemp(0, temp);
     }
     MBasicBlock *ifTrue() const {
         return getSuccessor(0);
     }
     MBasicBlock *ifFalse() const {
         return getSuccessor(1);
     }
     MTest *mir() const {
         return mir_->toTest();
     }
     MCompare *cmpMir() const {
         return cmpMir_;
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Not operation on an integer.
 class LNotI : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NotI)
     LNotI(const LAllocation &input) {
         setOperand(0, input);
     }
 };
 // Not operation on a double.
 class LNotD : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NotD)
     LNotD(const LAllocation &input) {
         setOperand(0, input);
     }
     MNot *mir() {
         return mir_->toNot();
     }
 };
 // Not operation on a float32.
 class LNotF : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NotF)
     LNotF(const LAllocation &input) {
         setOperand(0, input);
     }
     MNot *mir() {
         return mir_->toNot();
     }
 };
 // Boolean complement operation on an object.
 class LNotO : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NotO)
     LNotO(const LAllocation &input)
     {
         setOperand(0, input);
     }
     MNot *mir() {
         return mir_->toNot();
     }
 };
 // Boolean complement operation on a value.
 class LNotV : public LInstructionHelper<1, BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(NotV)
     static const size_t Input = 0;
     LNotV(const LDefinition &temp0, const LDefinition &temp1, const LDefinition &temp2)
     {
         setTemp(0, temp0);
         setTemp(1, temp1);
         setTemp(2, temp2);
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
     const LDefinition *temp1() {
         return getTemp(1);
     }
     const LDefinition *temp2() {
         return getTemp(2);
     }
     MNot *mir() {
         return mir_->toNot();
     }
 };
 // Bitwise not operation, takes a 32-bit integer as input and returning
 // a 32-bit integer result as an output.
 class LBitNotI : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(BitNotI)
 };
 // Call a VM function to perform a BITNOT operation.
 class LBitNotV : public LCallInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(BitNotV)
     static const size_t Input = 0;
 };
 // Binary bitwise operation, taking two 32-bit integers as inputs and returning
 // a 32-bit integer result as an output.
 class LBitOpI : public LInstructionHelper<1, 2, 0>
 {
     JSOp op_;
   public:
     LIR_HEADER(BitOpI)
     LBitOpI(JSOp op)
       : op_(op)
     { }
     const char *extraName() const {
         if (bitop() == JSOP_URSH && mir_->toUrsh()->bailoutsDisabled())
             return "ursh:BailoutsDisabled";
         return js_CodeName[op_];
     }
     JSOp bitop() const {
         return op_;
     }
 };
 // Call a VM function to perform a bitwise operation.
 class LBitOpV : public LCallInstructionHelper<1, 2 * BOX_PIECES, 0>
 {
     JSOp jsop_;
   public:
     LIR_HEADER(BitOpV)
     LBitOpV(JSOp jsop)
       : jsop_(jsop)
     { }
     JSOp jsop() const {
         return jsop_;
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
 };
 // Shift operation, taking two 32-bit integers as inputs and returning
 // a 32-bit integer result as an output.
 class LShiftI : public LBinaryMath<0>
 {
     JSOp op_;
   public:
     LIR_HEADER(ShiftI)
     LShiftI(JSOp op)
       : op_(op)
     { }
     JSOp bitop() {
         return op_;
     }
     MInstruction *mir() {
         return mir_->toInstruction();
     }
     const char *extraName() const {
         return js_CodeName[op_];
     }
 };
 class LUrshD : public LBinaryMath<1>
 {
   public:
     LIR_HEADER(UrshD)
     LUrshD(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp) {
         setOperand(0, lhs);
         setOperand(1, rhs);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Returns from the function being compiled (not used in inlined frames). The
 // input must be a box.
 class LReturn : public LInstructionHelper<0, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(Return)
 };
 class LThrow : public LCallInstructionHelper<0, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(Throw)
     static const size_t Value = 0;
 };
 class LMinMaxI : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(MinMaxI)
     LMinMaxI(const LAllocation &first, const LAllocation &second)
     {
         setOperand(0, first);
         setOperand(1, second);
     }
     const LAllocation *first() {
         return this->getOperand(0);
     }
     const LAllocation *second() {
         return this->getOperand(1);
     }
     const LDefinition *output() {
         return this->getDef(0);
     }
     MMinMax *mir() const {
         return mir_->toMinMax();
     }
     const char *extraName() const {
         return mir()->isMax() ? "Max" : "Min";
     }
 };
 class LMinMaxD : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(MinMaxD)
     LMinMaxD(const LAllocation &first, const LAllocation &second)
     {
         setOperand(0, first);
         setOperand(1, second);
     }
     const LAllocation *first() {
         return this->getOperand(0);
     }
     const LAllocation *second() {
         return this->getOperand(1);
     }
     const LDefinition *output() {
         return this->getDef(0);
     }
     MMinMax *mir() const {
         return mir_->toMinMax();
     }
     const char *extraName() const {
         return mir()->isMax() ? "Max" : "Min";
     }
 };
 // Negative of an integer
 class LNegI : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NegI);
     LNegI(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Negative of a double.
 class LNegD : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NegD)
     LNegD(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Negative of a float32.
 class LNegF : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(NegF)
     LNegF(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Absolute value of an integer.
 class LAbsI : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(AbsI)
     LAbsI(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Absolute value of a double.
 class LAbsD : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(AbsD)
     LAbsD(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Absolute value of a float32.
 class LAbsF : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(AbsF)
     LAbsF(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Square root of a double.
 class LSqrtD : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(SqrtD)
     LSqrtD(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Square root of a float32.
 class LSqrtF : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(SqrtF)
     LSqrtF(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 class LAtan2D : public LCallInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(Atan2D)
     LAtan2D(const LAllocation &y, const LAllocation &x, const LDefinition &temp) {
         setOperand(0, y);
         setOperand(1, x);
         setTemp(0, temp);
     }
     const LAllocation *y() {
         return getOperand(0);
     }
     const LAllocation *x() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *output() {
         return getDef(0);
     }
 };
 class LHypot : public LCallInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(Hypot)
     LHypot(const LAllocation &x, const LAllocation &y, const LDefinition &temp) {
         setOperand(0, x);
         setOperand(1, y);
         setTemp(0, temp);
     }
     const LAllocation *x() {
         return getOperand(0);
     }
     const LAllocation *y() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *output() {
         return getDef(0);
     }
 };
 // Double raised to an integer power.
 class LPowI : public LCallInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(PowI)
     LPowI(const LAllocation &value, const LAllocation &power, const LDefinition &temp) {
         setOperand(0, value);
         setOperand(1, power);
         setTemp(0, temp);
     }
     const LAllocation *value() {
         return getOperand(0);
     }
     const LAllocation *power() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Double raised to a double power.
 class LPowD : public LCallInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(PowD)
     LPowD(const LAllocation &value, const LAllocation &power, const LDefinition &temp) {
         setOperand(0, value);
         setOperand(1, power);
         setTemp(0, temp);
     }
     const LAllocation *value() {
         return getOperand(0);
     }
     const LAllocation *power() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Math.random().
 class LRandom : public LCallInstructionHelper<1, 0, 2>
 {
   public:
     LIR_HEADER(Random)
     LRandom(const LDefinition &temp, const LDefinition &temp2) {
         setTemp(0, temp);
         setTemp(1, temp2);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
 };
 class LMathFunctionD : public LCallInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(MathFunctionD)
     LMathFunctionD(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MMathFunction *mir() const {
         return mir_->toMathFunction();
     }
     const char *extraName() const {
         return MMathFunction::FunctionName(mir()->function());
     }
 };
 class LMathFunctionF : public LCallInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(MathFunctionF)
     LMathFunctionF(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MMathFunction *mir() const {
         return mir_->toMathFunction();
     }
     const char *extraName() const {
         return MMathFunction::FunctionName(mir()->function());
     }
 };
 // Adds two integers, returning an integer value.
 class LAddI : public LBinaryMath<0>
 {
     bool recoversInput_;
   public:
     LIR_HEADER(AddI)
     LAddI()
       : recoversInput_(false)
     { }
     const char *extraName() const {
         return snapshot() ? "OverflowCheck" : nullptr;
     }
     virtual bool recoversInput() const {
         return recoversInput_;
     }
     void setRecoversInput() {
         recoversInput_ = true;
     }
 };
 // Subtracts two integers, returning an integer value.
 class LSubI : public LBinaryMath<0>
 {
     bool recoversInput_;
   public:
     LIR_HEADER(SubI)
     LSubI()
       : recoversInput_(false)
     { }
     const char *extraName() const {
         return snapshot() ? "OverflowCheck" : nullptr;
     }
     virtual bool recoversInput() const {
         return recoversInput_;
     }
     void setRecoversInput() {
         recoversInput_ = true;
     }
 };
 // Performs an add, sub, mul, or div on two double values.
 class LMathD : public LBinaryMath<0>
 {
     JSOp jsop_;
   public:
     LIR_HEADER(MathD)
     LMathD(JSOp jsop)
       : jsop_(jsop)
     { }
     JSOp jsop() const {
         return jsop_;
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
 };
 // Performs an add, sub, mul, or div on two double values.
 class LMathF: public LBinaryMath<0>
 {
     JSOp jsop_;
   public:
     LIR_HEADER(MathF)
     LMathF(JSOp jsop)
       : jsop_(jsop)
     { }
     JSOp jsop() const {
         return jsop_;
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
 };
 class LModD : public LBinaryMath<1>
 {
   public:
     LIR_HEADER(ModD)
     LModD(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp) {
         setOperand(0, lhs);
         setOperand(1, rhs);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     bool isCall() const {
         return true;
     }
 };
 // Call a VM function to perform a binary operation.
 class LBinaryV : public LCallInstructionHelper<BOX_PIECES, 2 * BOX_PIECES, 0>
 {
     JSOp jsop_;
   public:
     LIR_HEADER(BinaryV)
     LBinaryV(JSOp jsop)
       : jsop_(jsop)
     { }
     JSOp jsop() const {
         return jsop_;
     }
     const char *extraName() const {
         return js_CodeName[jsop_];
     }
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
 };
 // Adds two string, returning a string.
 class LConcat : public LInstructionHelper<1, 2, 5>
 {
   public:
     LIR_HEADER(Concat)
     LConcat(const LAllocation &lhs, const LAllocation &rhs, const LDefinition &temp1,
             const LDefinition &temp2, const LDefinition &temp3, const LDefinition &temp4,
             const LDefinition &temp5)
     {
         setOperand(0, lhs);
         setOperand(1, rhs);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
         setTemp(3, temp4);
         setTemp(4, temp5);
     }
     const LAllocation *lhs() {
         return this->getOperand(0);
     }
     const LAllocation *rhs() {
         return this->getOperand(1);
     }
     const LDefinition *temp1() {
         return this->getTemp(0);
     }
     const LDefinition *temp2() {
         return this->getTemp(1);
     }
     const LDefinition *temp3() {
         return this->getTemp(2);
     }
     const LDefinition *temp4() {
         return this->getTemp(3);
     }
     const LDefinition *temp5() {
         return this->getTemp(4);
     }
 };
 class LConcatPar : public LInstructionHelper<1, 3, 4>
 {
   public:
     LIR_HEADER(ConcatPar)
     LConcatPar(const LAllocation &cx, const LAllocation &lhs, const LAllocation &rhs,
                const LDefinition &temp1, const LDefinition &temp2, const LDefinition &temp3,
                const LDefinition &temp4)
     {
         setOperand(0, cx);
         setOperand(1, lhs);
         setOperand(2, rhs);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
         setTemp(3, temp4);
     }
     const LAllocation *forkJoinContext() {
         return this->getOperand(0);
     }
     const LAllocation *lhs() {
         return this->getOperand(1);
     }
     const LAllocation *rhs() {
         return this->getOperand(2);
     }
     const LDefinition *temp1() {
         return this->getTemp(0);
     }
     const LDefinition *temp2() {
         return this->getTemp(1);
     }
     const LDefinition *temp3() {
         return this->getTemp(2);
     }
     const LDefinition *temp4() {
         return this->getTemp(3);
     }
 };
 // Get uint16 character code from a string.
 class LCharCodeAt : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(CharCodeAt)
     LCharCodeAt(const LAllocation &str, const LAllocation &index) {
         setOperand(0, str);
         setOperand(1, index);
     }
     const LAllocation *str() {
         return this->getOperand(0);
     }
     const LAllocation *index() {
         return this->getOperand(1);
     }
 };
 // Convert uint16 character code to a string.
 class LFromCharCode : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(FromCharCode)
     LFromCharCode(const LAllocation &code) {
         setOperand(0, code);
     }
     const LAllocation *code() {
         return this->getOperand(0);
     }
 };
 class LStringSplit : public LCallInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(StringSplit)
     LStringSplit(const LAllocation &string, const LAllocation &separator) {
         setOperand(0, string);
         setOperand(1, separator);
     }
     const LAllocation *string() {
         return getOperand(0);
     }
     const LAllocation *separator() {
         return getOperand(1);
     }
     const MStringSplit *mir() const {
         return mir_->toStringSplit();
     }
 };
 // Convert a 32-bit integer to a double.
 class LInt32ToDouble : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Int32ToDouble)
     LInt32ToDouble(const LAllocation &input) {
         setOperand(0, input);
     }
 };
 // Convert a 32-bit float to a double.
 class LFloat32ToDouble : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Float32ToDouble)
     LFloat32ToDouble(const LAllocation &input) {
         setOperand(0, input);
     }
 };
 // Convert a double to a 32-bit float.
 class LDoubleToFloat32 : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(DoubleToFloat32)
     LDoubleToFloat32(const LAllocation &input) {
         setOperand(0, input);
     }
 };
 // Convert a 32-bit integer to a float32.
 class LInt32ToFloat32 : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Int32ToFloat32)
     LInt32ToFloat32(const LAllocation &input) {
         setOperand(0, input);
     }
 };
 // Convert a value to a double.
 class LValueToDouble : public LInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(ValueToDouble)
     static const size_t Input = 0;
     MToDouble *mir() {
         return mir_->toToDouble();
     }
 };
 // Convert a value to a float32.
 class LValueToFloat32 : public LInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(ValueToFloat32)
     static const size_t Input = 0;
     MToFloat32 *mir() {
         return mir_->toToFloat32();
     }
 };
 // Convert a value to an int32.
 //   Input: components of a Value
 //   Output: 32-bit integer
 //   Bailout: undefined, string, object, or non-int32 double
 //   Temps: one float register, one GP register
 //
 // This instruction requires a temporary float register.
 class LValueToInt32 : public LInstructionHelper<1, BOX_PIECES, 2>
 {
   public:
     enum Mode {
         NORMAL,
         TRUNCATE
     };
   private:
     Mode mode_;
   public:
     LIR_HEADER(ValueToInt32)
     LValueToInt32(const LDefinition &temp0, const LDefinition &temp1, Mode mode)
       : mode_(mode)
     {
         setTemp(0, temp0);
         setTemp(1, temp1);
     }
     const char *extraName() const {
         return mode() == NORMAL ? "Normal" : "Truncate";
     }
     static const size_t Input = 0;
     Mode mode() const {
         return mode_;
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
     const LDefinition *temp() {
         return getTemp(1);
     }
     MToInt32 *mirNormal() const {
         JS_ASSERT(mode_ == NORMAL);
         return mir_->toToInt32();
     }
     MTruncateToInt32 *mirTruncate() const {
         JS_ASSERT(mode_ == TRUNCATE);
         return mir_->toTruncateToInt32();
     }
 };
 // Convert a double to an int32.
 //   Input: floating-point register
 //   Output: 32-bit integer
 //   Bailout: if the double cannot be converted to an integer.
 class LDoubleToInt32 : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(DoubleToInt32)
     LDoubleToInt32(const LAllocation &in) {
         setOperand(0, in);
     }
     MToInt32 *mir() const {
         return mir_->toToInt32();
     }
 };
 // Convert a float32 to an int32.
 //   Input: floating-point register
 //   Output: 32-bit integer
 //   Bailout: if the float32 cannot be converted to an integer.
 class LFloat32ToInt32 : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Float32ToInt32)
     LFloat32ToInt32(const LAllocation &in) {
         setOperand(0, in);
     }
     MToInt32 *mir() const {
         return mir_->toToInt32();
     }
 };
 // Convert a double to a truncated int32.
 //   Input: floating-point register
 //   Output: 32-bit integer
 class LTruncateDToInt32 : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(TruncateDToInt32)
     LTruncateDToInt32(const LAllocation &in, const LDefinition &temp) {
         setOperand(0, in);
         setTemp(0, temp);
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
 };
 // Convert a float32 to a truncated int32.
 //   Input: floating-point register
 //   Output: 32-bit integer
 class LTruncateFToInt32 : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(TruncateFToInt32)
     LTruncateFToInt32(const LAllocation &in, const LDefinition &temp) {
         setOperand(0, in);
         setTemp(0, temp);
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
 };
 // Convert a boolean value to a string.
 class LBooleanToString : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(BooleanToString)
     LBooleanToString(const LAllocation &input) {
         setOperand(0, input);
     }
     const MToString *mir() {
         return mir_->toToString();
     }
 };
 // Convert an integer hosted on one definition to a string with a function call.
 class LIntToString : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(IntToString)
     LIntToString(const LAllocation &input) {
         setOperand(0, input);
     }
     const MToString *mir() {
         return mir_->toToString();
     }
 };
 // Convert a double hosted on one definition to a string with a function call.
 class LDoubleToString : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(DoubleToString)
     LDoubleToString(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LDefinition *tempInt() {
         return getTemp(0);
     }
     const MToString *mir() {
         return mir_->toToString();
     }
 };
 // Convert a primitive to a string with a function call.
 class LPrimitiveToString : public LInstructionHelper<1, BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(PrimitiveToString)
     LPrimitiveToString(const LDefinition &tempToUnbox)
     {
         setTemp(0, tempToUnbox);
     }
     static const size_t Input = 0;
     const MToString *mir() {
         return mir_->toToString();
     }
     const LDefinition *tempToUnbox() {
         return getTemp(0);
     }
 };
 // No-op instruction that is used to hold the entry snapshot. This simplifies
 // register allocation as it doesn't need to sniff the snapshot out of the
 // LIRGraph.
 class LStart : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(Start)
 };
 // Passed the BaselineFrame address in the OsrFrameReg by SideCannon().
 // Forwards this object to the LOsrValues for Value materialization.
 class LOsrEntry : public LInstructionHelper<1, 0, 0>
 {
   protected:
     Label label_;
     uint32_t frameDepth_;
   public:
     LIR_HEADER(OsrEntry)
     LOsrEntry()
       : frameDepth_(0)
     { }
     void setFrameDepth(uint32_t depth) {
         frameDepth_ = depth;
     }
     uint32_t getFrameDepth() {
         return frameDepth_;
     }
     Label *label() {
         return &label_;
     }
 };
 // Materialize a Value stored in an interpreter frame for OSR.
 class LOsrValue : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(OsrValue)
     LOsrValue(const LAllocation &entry)
     {
         setOperand(0, entry);
     }
     const MOsrValue *mir() {
         return mir_->toOsrValue();
     }
 };
 // Materialize a JSObject scope chain stored in an interpreter frame for OSR.
 class LOsrScopeChain : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(OsrScopeChain)
     LOsrScopeChain(const LAllocation &entry)
     {
         setOperand(0, entry);
     }
     const MOsrScopeChain *mir() {
         return mir_->toOsrScopeChain();
     }
 };
 // Materialize a JSObject scope chain stored in an interpreter frame for OSR.
 class LOsrReturnValue : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(OsrReturnValue)
     LOsrReturnValue(const LAllocation &entry)
     {
         setOperand(0, entry);
     }
     const MOsrReturnValue *mir() {
         return mir_->toOsrReturnValue();
     }
 };
 // Materialize a JSObject ArgumentsObject stored in an interpreter frame for OSR.
 class LOsrArgumentsObject : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(OsrArgumentsObject)
     LOsrArgumentsObject(const LAllocation &entry)
     {
         setOperand(0, entry);
     }
     const MOsrArgumentsObject *mir() {
         return mir_->toOsrArgumentsObject();
     }
 };
 class LRegExp : public LCallInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(RegExp)
     const MRegExp *mir() const {
         return mir_->toRegExp();
     }
 };
 class LRegExpExec : public LCallInstructionHelper<BOX_PIECES, 2, 0>
 {
   public:
     LIR_HEADER(RegExpExec)
     LRegExpExec(const LAllocation &regexp, const LAllocation &string)
     {
         setOperand(0, regexp);
         setOperand(1, string);
     }
     const LAllocation *regexp() {
         return getOperand(0);
     }
     const LAllocation *string() {
         return getOperand(1);
     }
     const MRegExpExec *mir() const {
         return mir_->toRegExpExec();
     }
 };
 class LRegExpTest : public LCallInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(RegExpTest)
     LRegExpTest(const LAllocation &regexp, const LAllocation &string)
     {
         setOperand(0, regexp);
         setOperand(1, string);
     }
     const LAllocation *regexp() {
         return getOperand(0);
     }
     const LAllocation *string() {
         return getOperand(1);
     }
     const MRegExpTest *mir() const {
         return mir_->toRegExpTest();
     }
 };
 class LStrReplace : public LCallInstructionHelper<1, 3, 0>
 {
   public:
     LStrReplace(const LAllocation &string, const LAllocation &pattern,
                    const LAllocation &replacement)
     {
         setOperand(0, string);
         setOperand(1, pattern);
         setOperand(2, replacement);
     }
     const LAllocation *string() {
         return getOperand(0);
     }
     const LAllocation *pattern() {
         return getOperand(1);
     }
     const LAllocation *replacement() {
         return getOperand(2);
     }
 };
 class LRegExpReplace: public LStrReplace
 {
   public:
     LIR_HEADER(RegExpReplace);
     LRegExpReplace(const LAllocation &string, const LAllocation &pattern,
                    const LAllocation &replacement)
       : LStrReplace(string, pattern, replacement)
     {
     }
     const MRegExpReplace *mir() const {
         return mir_->toRegExpReplace();
     }
 };
 class LStringReplace: public LStrReplace
 {
   public:
     LIR_HEADER(StringReplace);
     LStringReplace(const LAllocation &string, const LAllocation &pattern,
                    const LAllocation &replacement)
       : LStrReplace(string, pattern, replacement)
     {
     }
     const MStringReplace *mir() const {
         return mir_->toStringReplace();
     }
 };
 class LLambdaForSingleton : public LCallInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(LambdaForSingleton)
     LLambdaForSingleton(const LAllocation &scopeChain)
     {
         setOperand(0, scopeChain);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     const MLambda *mir() const {
         return mir_->toLambda();
     }
 };
 class LLambda : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(Lambda)
     LLambda(const LAllocation &scopeChain, const LDefinition &temp) {
         setOperand(0, scopeChain);
         setTemp(0, temp);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MLambda *mir() const {
         return mir_->toLambda();
     }
 };
 class LLambdaArrow : public LInstructionHelper<1, 1 + BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(LambdaArrow)
     static const size_t ThisValue = 1;
     LLambdaArrow(const LAllocation &scopeChain, const LDefinition &temp) {
         setOperand(0, scopeChain);
         setTemp(0, temp);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MLambdaArrow *mir() const {
         return mir_->toLambdaArrow();
     }
 };
 class LLambdaPar : public LInstructionHelper<1, 2, 2>
 {
   public:
     LIR_HEADER(LambdaPar);
     LLambdaPar(const LAllocation &cx, const LAllocation &scopeChain,
                const LDefinition &temp1, const LDefinition &temp2)
     {
         setOperand(0, cx);
         setOperand(1, scopeChain);
         setTemp(0, temp1);
         setTemp(1, temp2);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LAllocation *scopeChain() {
         return getOperand(1);
     }
     const MLambdaPar *mir() const {
         return mir_->toLambdaPar();
     }
     const LDefinition *getTemp0() {
         return getTemp(0);
     }
     const LDefinition *getTemp1() {
         return getTemp(1);
     }
 };
 // Determines the implicit |this| value for function calls.
 class LImplicitThis : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(ImplicitThis)
     LImplicitThis(const LAllocation &callee) {
         setOperand(0, callee);
     }
     const MImplicitThis *mir() const {
         return mir_->toImplicitThis();
     }
     const LAllocation *callee() {
         return getOperand(0);
     }
 };
 // Load the "slots" member out of a JSObject.
 //   Input: JSObject pointer
 //   Output: slots pointer
 class LSlots : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Slots)
     LSlots(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
 };
 // Load the "elements" member out of a JSObject.
 //   Input: JSObject pointer
 //   Output: elements pointer
 class LElements : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Elements)
     LElements(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
 };
 // If necessary, convert any int32 elements in a vector into doubles.
 class LConvertElementsToDoubles : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(ConvertElementsToDoubles)
     LConvertElementsToDoubles(const LAllocation &elements) {
         setOperand(0, elements);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
 };
 // If |elements| has the CONVERT_DOUBLE_ELEMENTS flag, convert int32 value to
 // double. Else return the original value.
 class LMaybeToDoubleElement : public LInstructionHelper<BOX_PIECES, 2, 1>
 {
   public:
     LIR_HEADER(MaybeToDoubleElement)
     LMaybeToDoubleElement(const LAllocation &elements, const LAllocation &value,
                           const LDefinition &tempFloat) {
         setOperand(0, elements);
         setOperand(1, value);
         setTemp(0, tempFloat);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
 };
 // Load the initialized length from an elements header.
 class LInitializedLength : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(InitializedLength)
     LInitializedLength(const LAllocation &elements) {
         setOperand(0, elements);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
 };
 // Store to the initialized length in an elements header. Note the input is an
 // *index*, one less than the desired initialized length.
 class LSetInitializedLength : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(SetInitializedLength)
     LSetInitializedLength(const LAllocation &elements, const LAllocation &index) {
         setOperand(0, elements);
         setOperand(1, index);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 // Load the length from an elements header.
 class LArrayLength : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(ArrayLength)
     LArrayLength(const LAllocation &elements) {
         setOperand(0, elements);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
 };
 // Store to the length in an elements header. Note the input is an *index*,
 // one less than the desired length.
 class LSetArrayLength : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(SetArrayLength)
     LSetArrayLength(const LAllocation &elements, const LAllocation &index) {
         setOperand(0, elements);
         setOperand(1, index);
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 // Read the length of a typed array.
 class LTypedArrayLength : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(TypedArrayLength)
     LTypedArrayLength(const LAllocation &obj) {
         setOperand(0, obj);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
 };
 // Load a typed array's elements vector.
 class LTypedArrayElements : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(TypedArrayElements)
     LTypedArrayElements(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
 };
 // Load a typed array's elements vector.
 class LTypedObjectElements : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(TypedObjectElements)
     LTypedObjectElements(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const MTypedObjectElements *mir() const {
         return mir_->toTypedObjectElements();
     }
 };
 // Load a typed array's elements vector.
 class LSetTypedObjectOffset : public LInstructionHelper<0, 2, 1>
 {
   public:
     LIR_HEADER(SetTypedObjectOffset)
     LSetTypedObjectOffset(const LAllocation &object,
                           const LAllocation &offset,
                           const LDefinition &temp0)
     {
         setOperand(0, object);
         setOperand(1, offset);
         setTemp(0, temp0);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *offset() {
         return getOperand(1);
     }
     const LDefinition *temp0() {
         return getTemp(0);
     }
 };
 // Check whether a typed object has a neutered owner buffer.
 class LNeuterCheck : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(NeuterCheck)
     LNeuterCheck(const LAllocation &object, const LDefinition &temp) {
         setOperand(0, object);
         setTemp(0, temp);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Bailout if index >= length.
 class LBoundsCheck : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(BoundsCheck)
     LBoundsCheck(const LAllocation &index, const LAllocation &length) {
         setOperand(0, index);
         setOperand(1, length);
     }
     const MBoundsCheck *mir() const {
         return mir_->toBoundsCheck();
     }
     const LAllocation *index() {
         return getOperand(0);
     }
     const LAllocation *length() {
         return getOperand(1);
     }
 };
 // Bailout if index + minimum < 0 or index + maximum >= length.
 class LBoundsCheckRange : public LInstructionHelper<0, 2, 1>
 {
   public:
     LIR_HEADER(BoundsCheckRange)
     LBoundsCheckRange(const LAllocation &index, const LAllocation &length,
                       const LDefinition &temp)
     {
         setOperand(0, index);
         setOperand(1, length);
         setTemp(0, temp);
     }
     const MBoundsCheck *mir() const {
         return mir_->toBoundsCheck();
     }
     const LAllocation *index() {
         return getOperand(0);
     }
     const LAllocation *length() {
         return getOperand(1);
     }
 };
 // Bailout if index < minimum.
 class LBoundsCheckLower : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(BoundsCheckLower)
     LBoundsCheckLower(const LAllocation &index)
     {
         setOperand(0, index);
     }
     MBoundsCheckLower *mir() const {
         return mir_->toBoundsCheckLower();
     }
     const LAllocation *index() {
         return getOperand(0);
     }
 };
 // Load a value from a dense array's elements vector. Bail out if it's the hole value.
 class LLoadElementV : public LInstructionHelper<BOX_PIECES, 2, 0>
 {
   public:
     LIR_HEADER(LoadElementV)
     LLoadElementV(const LAllocation &elements, const LAllocation &index) {
         setOperand(0, elements);
         setOperand(1, index);
     }
     const char *extraName() const {
         return mir()->needsHoleCheck() ? "HoleCheck" : nullptr;
     }
     const MLoadElement *mir() const {
         return mir_->toLoadElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 class LInArray : public LInstructionHelper<1, 4, 0>
 {
   public:
     LIR_HEADER(InArray)
     LInArray(const LAllocation &elements, const LAllocation &index,
              const LAllocation &initLength, const LAllocation &object)
     {
         setOperand(0, elements);
         setOperand(1, index);
         setOperand(2, initLength);
         setOperand(3, object);
     }
     const MInArray *mir() const {
         return mir_->toInArray();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LAllocation *initLength() {
         return getOperand(2);
     }
     const LAllocation *object() {
         return getOperand(3);
     }
 };
 // Load a value from a dense array's elements vector. Bail out if it's the hole value.
 class LLoadElementHole : public LInstructionHelper<BOX_PIECES, 3, 0>
 {
   public:
     LIR_HEADER(LoadElementHole)
     LLoadElementHole(const LAllocation &elements, const LAllocation &index, const LAllocation &initLength) {
         setOperand(0, elements);
         setOperand(1, index);
         setOperand(2, initLength);
     }
     const char *extraName() const {
         return mir()->needsHoleCheck() ? "HoleCheck" : nullptr;
     }
     const MLoadElementHole *mir() const {
         return mir_->toLoadElementHole();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LAllocation *initLength() {
         return getOperand(2);
     }
 };
 // Load a typed value from a dense array's elements vector. The array must be
 // known to be packed, so that we don't have to check for the hole value.
 // This instruction does not load the type tag and can directly load into a
 // FP register.
 class LLoadElementT : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(LoadElementT)
     LLoadElementT(const LAllocation &elements, const LAllocation &index) {
         setOperand(0, elements);
         setOperand(1, index);
     }
     const char *extraName() const {
         return mir()->needsHoleCheck() ? "HoleCheck"
                                        : (mir()->loadDoubles() ? "Doubles" : nullptr);
     }
     const MLoadElement *mir() const {
         return mir_->toLoadElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 // Store a boxed value to a dense array's element vector.
 class LStoreElementV : public LInstructionHelper<0, 2 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(StoreElementV)
     LStoreElementV(const LAllocation &elements, const LAllocation &index) {
         setOperand(0, elements);
         setOperand(1, index);
     }
     const char *extraName() const {
         return mir()->needsHoleCheck() ? "HoleCheck" : nullptr;
     }
     static const size_t Value = 2;
     const MStoreElement *mir() const {
         return mir_->toStoreElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 // Store a typed value to a dense array's elements vector. Compared to
 // LStoreElementV, this instruction can store doubles and constants directly,
 // and does not store the type tag if the array is monomorphic and known to
 // be packed.
 class LStoreElementT : public LInstructionHelper<0, 3, 0>
 {
   public:
     LIR_HEADER(StoreElementT)
     LStoreElementT(const LAllocation &elements, const LAllocation &index, const LAllocation &value) {
         setOperand(0, elements);
         setOperand(1, index);
         setOperand(2, value);
     }
     const char *extraName() const {
         return mir()->needsHoleCheck() ? "HoleCheck" : nullptr;
     }
     const MStoreElement *mir() const {
         return mir_->toStoreElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LAllocation *value() {
         return getOperand(2);
     }
 };
 // Like LStoreElementV, but supports indexes >= initialized length.
 class LStoreElementHoleV : public LInstructionHelper<0, 3 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(StoreElementHoleV)
     LStoreElementHoleV(const LAllocation &object, const LAllocation &elements,
                        const LAllocation &index) {
         setOperand(0, object);
         setOperand(1, elements);
         setOperand(2, index);
     }
     static const size_t Value = 3;
     const MStoreElementHole *mir() const {
         return mir_->toStoreElementHole();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *elements() {
         return getOperand(1);
     }
     const LAllocation *index() {
         return getOperand(2);
     }
 };
 // Like LStoreElementT, but supports indexes >= initialized length.
 class LStoreElementHoleT : public LInstructionHelper<0, 4, 0>
 {
   public:
     LIR_HEADER(StoreElementHoleT)
     LStoreElementHoleT(const LAllocation &object, const LAllocation &elements,
                        const LAllocation &index, const LAllocation &value) {
         setOperand(0, object);
         setOperand(1, elements);
         setOperand(2, index);
         setOperand(3, value);
     }
     const MStoreElementHole *mir() const {
         return mir_->toStoreElementHole();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *elements() {
         return getOperand(1);
     }
     const LAllocation *index() {
         return getOperand(2);
     }
     const LAllocation *value() {
         return getOperand(3);
     }
 };
 class LArrayPopShiftV : public LInstructionHelper<BOX_PIECES, 1, 2>
 {
   public:
     LIR_HEADER(ArrayPopShiftV)
     LArrayPopShiftV(const LAllocation &object, const LDefinition &temp0, const LDefinition &temp1) {
         setOperand(0, object);
         setTemp(0, temp0);
         setTemp(1, temp1);
     }
     const char *extraName() const {
         return mir()->mode() == MArrayPopShift::Pop ? "Pop" : "Shift";
     }
     const MArrayPopShift *mir() const {
         return mir_->toArrayPopShift();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp0() {
         return getTemp(0);
     }
     const LDefinition *temp1() {
         return getTemp(1);
     }
 };
 class LArrayPopShiftT : public LInstructionHelper<1, 1, 2>
 {
   public:
     LIR_HEADER(ArrayPopShiftT)
     LArrayPopShiftT(const LAllocation &object, const LDefinition &temp0, const LDefinition &temp1) {
         setOperand(0, object);
         setTemp(0, temp0);
         setTemp(1, temp1);
     }
     const char *extraName() const {
         return mir()->mode() == MArrayPopShift::Pop ? "Pop" : "Shift";
     }
     const MArrayPopShift *mir() const {
         return mir_->toArrayPopShift();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp0() {
         return getTemp(0);
     }
     const LDefinition *temp1() {
         return getTemp(1);
     }
 };
 class LArrayPushV : public LInstructionHelper<1, 1 + BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(ArrayPushV)
     LArrayPushV(const LAllocation &object, const LDefinition &temp) {
         setOperand(0, object);
         setTemp(0, temp);
     }
     static const size_t Value = 1;
     const MArrayPush *mir() const {
         return mir_->toArrayPush();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 class LArrayPushT : public LInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(ArrayPushT)
     LArrayPushT(const LAllocation &object, const LAllocation &value, const LDefinition &temp) {
         setOperand(0, object);
         setOperand(1, value);
         setTemp(0, temp);
     }
     const MArrayPush *mir() const {
         return mir_->toArrayPush();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 class LArrayConcat : public LCallInstructionHelper<1, 2, 2>
 {
   public:
     LIR_HEADER(ArrayConcat)
     LArrayConcat(const LAllocation &lhs, const LAllocation &rhs,
                  const LDefinition &temp1, const LDefinition &temp2) {
         setOperand(0, lhs);
         setOperand(1, rhs);
         setTemp(0, temp1);
         setTemp(1, temp2);
     }
     const MArrayConcat *mir() const {
         return mir_->toArrayConcat();
     }
     const LAllocation *lhs() {
         return getOperand(0);
     }
     const LAllocation *rhs() {
         return getOperand(1);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
 };
 // Load a typed value from a typed array's elements vector.
 class LLoadTypedArrayElement : public LInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(LoadTypedArrayElement)
     LLoadTypedArrayElement(const LAllocation &elements, const LAllocation &index,
                            const LDefinition &temp) {
         setOperand(0, elements);
         setOperand(1, index);
         setTemp(0, temp);
     }
     const MLoadTypedArrayElement *mir() const {
         return mir_->toLoadTypedArrayElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 class LLoadTypedArrayElementHole : public LInstructionHelper<BOX_PIECES, 2, 0>
 {
   public:
     LIR_HEADER(LoadTypedArrayElementHole)
     LLoadTypedArrayElementHole(const LAllocation &object, const LAllocation &index) {
         setOperand(0, object);
         setOperand(1, index);
     }
     const MLoadTypedArrayElementHole *mir() const {
         return mir_->toLoadTypedArrayElementHole();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 class LLoadTypedArrayElementStatic : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(LoadTypedArrayElementStatic);
     LLoadTypedArrayElementStatic(const LAllocation &ptr) {
         setOperand(0, ptr);
     }
     MLoadTypedArrayElementStatic *mir() const {
         return mir_->toLoadTypedArrayElementStatic();
     }
     const LAllocation *ptr() {
         return getOperand(0);
     }
 };
 class LStoreTypedArrayElement : public LInstructionHelper<0, 3, 0>
 {
   public:
     LIR_HEADER(StoreTypedArrayElement)
     LStoreTypedArrayElement(const LAllocation &elements, const LAllocation &index,
                             const LAllocation &value) {
         setOperand(0, elements);
         setOperand(1, index);
         setOperand(2, value);
     }
     const MStoreTypedArrayElement *mir() const {
         return mir_->toStoreTypedArrayElement();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LAllocation *value() {
         return getOperand(2);
     }
 };
 class LStoreTypedArrayElementHole : public LInstructionHelper<0, 4, 0>
 {
   public:
     LIR_HEADER(StoreTypedArrayElementHole)
     LStoreTypedArrayElementHole(const LAllocation &elements, const LAllocation &length,
                                 const LAllocation &index, const LAllocation &value)
     {
         setOperand(0, elements);
         setOperand(1, length);
         setOperand(2, index);
         setOperand(3, value);
     }
     const MStoreTypedArrayElementHole *mir() const {
         return mir_->toStoreTypedArrayElementHole();
     }
     const LAllocation *elements() {
         return getOperand(0);
     }
     const LAllocation *length() {
         return getOperand(1);
     }
     const LAllocation *index() {
         return getOperand(2);
     }
     const LAllocation *value() {
         return getOperand(3);
     }
 };
 class LStoreTypedArrayElementStatic : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(StoreTypedArrayElementStatic);
     LStoreTypedArrayElementStatic(const LAllocation &ptr, const LAllocation &value) {
         setOperand(0, ptr);
         setOperand(1, value);
     }
     MStoreTypedArrayElementStatic *mir() const {
         return mir_->toStoreTypedArrayElementStatic();
     }
     const LAllocation *ptr() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
 };
 class LEffectiveAddress : public LInstructionHelper<1, 2, 0>
 {
   public:
     LIR_HEADER(EffectiveAddress);
     LEffectiveAddress(const LAllocation &base, const LAllocation &index) {
         setOperand(0, base);
         setOperand(1, index);
     }
     const MEffectiveAddress *mir() const {
         return mir_->toEffectiveAddress();
     }
     const LAllocation *base() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
 };
 class LClampIToUint8 : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(ClampIToUint8)
     LClampIToUint8(const LAllocation &in) {
         setOperand(0, in);
     }
 };
 class LClampDToUint8 : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(ClampDToUint8)
     LClampDToUint8(const LAllocation &in, const LDefinition &temp) {
         setOperand(0, in);
         setTemp(0, temp);
     }
 };
 class LClampVToUint8 : public LInstructionHelper<1, BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(ClampVToUint8)
     LClampVToUint8(const LDefinition &tempFloat) {
         setTemp(0, tempFloat);
     }
     static const size_t Input = 0;
     const LDefinition *tempFloat() {
         return getTemp(0);
     }
     const MClampToUint8 *mir() const {
         return mir_->toClampToUint8();
     }
 };
 // Load a boxed value from an object's fixed slot.
 class LLoadFixedSlotV : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(LoadFixedSlotV)
     LLoadFixedSlotV(const LAllocation &object) {
         setOperand(0, object);
     }
     const MLoadFixedSlot *mir() const {
         return mir_->toLoadFixedSlot();
     }
 };
 // Load a typed value from an object's fixed slot.
 class LLoadFixedSlotT : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(LoadFixedSlotT)
     LLoadFixedSlotT(const LAllocation &object) {
         setOperand(0, object);
     }
     const MLoadFixedSlot *mir() const {
         return mir_->toLoadFixedSlot();
     }
 };
 // Store a boxed value to an object's fixed slot.
 class LStoreFixedSlotV : public LInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(StoreFixedSlotV)
     LStoreFixedSlotV(const LAllocation &obj) {
         setOperand(0, obj);
     }
     static const size_t Value = 1;
     const MStoreFixedSlot *mir() const {
         return mir_->toStoreFixedSlot();
     }
     const LAllocation *obj() {
         return getOperand(0);
     }
 };
 // Store a typed value to an object's fixed slot.
 class LStoreFixedSlotT : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(StoreFixedSlotT)
     LStoreFixedSlotT(const LAllocation &obj, const LAllocation &value)
     {
         setOperand(0, obj);
         setOperand(1, value);
     }
     const MStoreFixedSlot *mir() const {
         return mir_->toStoreFixedSlot();
     }
     const LAllocation *obj() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
 };
 // Note, Name ICs always return a Value. There are no V/T variants.
 class LGetNameCache : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(GetNameCache)
     LGetNameCache(const LAllocation &scopeObj) {
         setOperand(0, scopeObj);
     }
     const LAllocation *scopeObj() {
         return getOperand(0);
     }
     const MGetNameCache *mir() const {
         return mir_->toGetNameCache();
     }
 };
 class LCallGetIntrinsicValue : public LCallInstructionHelper<BOX_PIECES, 0, 0>
 {
   public:
     LIR_HEADER(CallGetIntrinsicValue)
     const MCallGetIntrinsicValue *mir() const {
         return mir_->toCallGetIntrinsicValue();
     }
 };
 class LCallsiteCloneCache : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(CallsiteCloneCache);
     LCallsiteCloneCache(const LAllocation &callee) {
         setOperand(0, callee);
     }
     const LAllocation *callee() {
         return getOperand(0);
     }
     const MCallsiteCloneCache *mir() const {
         return mir_->toCallsiteCloneCache();
     }
 };
 // Patchable jump to stubs generated for a GetProperty cache, which loads a
 // boxed value.
 class LGetPropertyCacheV : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(GetPropertyCacheV)
     LGetPropertyCacheV(const LAllocation &object) {
         setOperand(0, object);
     }
     const MGetPropertyCache *mir() const {
         return mir_->toGetPropertyCache();
     }
 };
 // Patchable jump to stubs generated for a GetProperty cache, which loads a
 // value of a known type, possibly into an FP register.
 class LGetPropertyCacheT : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(GetPropertyCacheT)
     LGetPropertyCacheT(const LAllocation &object, const LDefinition &temp) {
         setOperand(0, object);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MGetPropertyCache *mir() const {
         return mir_->toGetPropertyCache();
     }
 };
 // Emit code to load a boxed value from an object's slots if its shape matches
 // one of the shapes observed by the baseline IC, else bails out.
 class LGetPropertyPolymorphicV : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(GetPropertyPolymorphicV)
     LGetPropertyPolymorphicV(const LAllocation &obj) {
         setOperand(0, obj);
     }
     const LAllocation *obj() {
         return getOperand(0);
     }
     const MGetPropertyPolymorphic *mir() const {
         return mir_->toGetPropertyPolymorphic();
     }
 };
 // Emit code to load a typed value from an object's slots if its shape matches
 // one of the shapes observed by the baseline IC, else bails out.
 class LGetPropertyPolymorphicT : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(GetPropertyPolymorphicT)
     LGetPropertyPolymorphicT(const LAllocation &obj, const LDefinition &temp) {
         setOperand(0, obj);
         setTemp(0, temp);
     }
     const LAllocation *obj() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MGetPropertyPolymorphic *mir() const {
         return mir_->toGetPropertyPolymorphic();
     }
 };
 // Emit code to store a boxed value to an object's slots if its shape matches
 // one of the shapes observed by the baseline IC, else bails out.
 class LSetPropertyPolymorphicV : public LInstructionHelper<0, 1 + BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(SetPropertyPolymorphicV)
     LSetPropertyPolymorphicV(const LAllocation &obj, const LDefinition &temp) {
         setOperand(0, obj);
         setTemp(0, temp);
     }
     static const size_t Value = 1;
     const LAllocation *obj() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MSetPropertyPolymorphic *mir() const {
         return mir_->toSetPropertyPolymorphic();
     }
 };
 // Emit code to store a typed value to an object's slots if its shape matches
 // one of the shapes observed by the baseline IC, else bails out.
 class LSetPropertyPolymorphicT : public LInstructionHelper<0, 2, 1>
 {
     MIRType valueType_;
   public:
     LIR_HEADER(SetPropertyPolymorphicT)
     LSetPropertyPolymorphicT(const LAllocation &obj, const LAllocation &value, MIRType valueType,
                              const LDefinition &temp)
       : valueType_(valueType)
     {
         setOperand(0, obj);
         setOperand(1, value);
         setTemp(0, temp);
     }
     const LAllocation *obj() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MIRType valueType() const {
         return valueType_;
     }
     const MSetPropertyPolymorphic *mir() const {
         return mir_->toSetPropertyPolymorphic();
     }
     const char *extraName() const {
         return StringFromMIRType(valueType_);
     }
 };
 class LGetElementCacheV : public LInstructionHelper<BOX_PIECES, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(GetElementCacheV)
     static const size_t Index = 1;
     LGetElementCacheV(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const MGetElementCache *mir() const {
         return mir_->toGetElementCache();
     }
 };
 class LGetElementCacheT : public LInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(GetElementCacheT)
     LGetElementCacheT(const LAllocation &object, const LAllocation &index,
                       const LDefinition &temp) {
         setOperand(0, object);
         setOperand(1, index);
         setTemp(0, temp);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *index() {
         return getOperand(1);
     }
     const LDefinition *output() {
         return getDef(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     const MGetElementCache *mir() const {
         return mir_->toGetElementCache();
     }
 };
 class LBindNameCache : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(BindNameCache)
     LBindNameCache(const LAllocation &scopeChain) {
         setOperand(0, scopeChain);
     }
     const LAllocation *scopeChain() {
         return getOperand(0);
     }
     const MBindNameCache *mir() const {
         return mir_->toBindNameCache();
     }
 };
 // Load a value from an object's dslots or a slots vector.
 class LLoadSlotV : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(LoadSlotV)
     LLoadSlotV(const LAllocation &in) {
         setOperand(0, in);
     }
     const MLoadSlot *mir() const {
         return mir_->toLoadSlot();
     }
 };
 // Load a typed value from an object's dslots or a slots vector. Unlike
 // LLoadSlotV, this can bypass extracting a type tag, directly retrieving a
 // pointer, integer, or double.
 class LLoadSlotT : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(LoadSlotT)
     LLoadSlotT(const LAllocation &in) {
         setOperand(0, in);
     }
     const MLoadSlot *mir() const {
         return mir_->toLoadSlot();
     }
 };
 // Store a value to an object's dslots or a slots vector.
 class LStoreSlotV : public LInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(StoreSlotV)
     LStoreSlotV(const LAllocation &slots) {
         setOperand(0, slots);
     }
     static const size_t Value = 1;
     const MStoreSlot *mir() const {
         return mir_->toStoreSlot();
     }
     const LAllocation *slots() {
         return getOperand(0);
     }
 };
 // Store a typed value to an object's dslots or a slots vector. This has a
 // few advantages over LStoreSlotV:
 // 1) We can bypass storing the type tag if the slot has the same type as
 //    the value.
 // 2) Better register allocation: we can store constants and FP regs directly
 //    without requiring a second register for the value.
 class LStoreSlotT : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(StoreSlotT)
     LStoreSlotT(const LAllocation &slots, const LAllocation &value) {
         setOperand(0, slots);
         setOperand(1, value);
     }
     const MStoreSlot *mir() const {
         return mir_->toStoreSlot();
     }
     const LAllocation *slots() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
 };
 // Read length field of a JSString*.
 class LStringLength : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(StringLength)
     LStringLength(const LAllocation &string) {
         setOperand(0, string);
     }
     const LAllocation *string() {
         return getOperand(0);
     }
 };
 // Take the floor of a double precision number. Implements Math.floor().
 class LFloor : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(Floor)
     LFloor(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Take the floor of a single precision number. Implements Math.floor().
 class LFloorF : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(FloorF)
     LFloorF(const LAllocation &num) {
         setOperand(0, num);
     }
 };
 // Round a double precision number. Implements Math.round().
 class LRound : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(Round)
     LRound(const LAllocation &num, const LDefinition &temp) {
         setOperand(0, num);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MRound *mir() const {
         return mir_->toRound();
     }
 };
 // Round a single precision number. Implements Math.round().
 class LRoundF : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(RoundF)
     LRoundF(const LAllocation &num, const LDefinition &temp) {
         setOperand(0, num);
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MRound *mir() const {
         return mir_->toRound();
     }
 };
 // Load a function's call environment.
 class LFunctionEnvironment : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(FunctionEnvironment)
     LFunctionEnvironment(const LAllocation &function) {
         setOperand(0, function);
     }
     const LAllocation *function() {
         return getOperand(0);
     }
 };
 class LForkJoinContext : public LCallInstructionHelper<1, 0, 1>
 {
   public:
     LIR_HEADER(ForkJoinContext);
     LForkJoinContext(const LDefinition &temp1) {
         setTemp(0, temp1);
     }
     const LDefinition *getTempReg() {
         return getTemp(0);
     }
 };
 class LForkJoinGetSlice : public LInstructionHelper<1, 1, 4>
 {
   public:
     LIR_HEADER(ForkJoinGetSlice);
     LForkJoinGetSlice(const LAllocation &cx,
                       const LDefinition &temp1, const LDefinition &temp2,
                       const LDefinition &temp3, const LDefinition &temp4) {
         setOperand(0, cx);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
         setTemp(3, temp4);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
     const LDefinition *temp4() {
         return getTemp(3);
     }
 };
 class LCallGetProperty : public LCallInstructionHelper<BOX_PIECES, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallGetProperty)
     static const size_t Value = 0;
     MCallGetProperty *mir() const {
         return mir_->toCallGetProperty();
     }
 };
 // Call js::GetElement.
 class LCallGetElement : public LCallInstructionHelper<BOX_PIECES, 2 * BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallGetElement)
     static const size_t LhsInput = 0;
     static const size_t RhsInput = BOX_PIECES;
     MCallGetElement *mir() const {
         return mir_->toCallGetElement();
     }
 };
 // Call js::SetElement.
 class LCallSetElement : public LCallInstructionHelper<0, 1 + 2 * BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallSetElement)
     static const size_t Index = 1;
     static const size_t Value = 1 + BOX_PIECES;
 };
 // Call js::InitElementArray.
 class LCallInitElementArray : public LCallInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
 public:
     LIR_HEADER(CallInitElementArray)
     static const size_t Value = 1;
     const MCallInitElementArray *mir() const {
         return mir_->toCallInitElementArray();
     }
 };
 // Call a VM function to perform a property or name assignment of a generic value.
 class LCallSetProperty : public LCallInstructionHelper<0, 1 + BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallSetProperty)
     LCallSetProperty(const LAllocation &obj) {
         setOperand(0, obj);
     }
     static const size_t Value = 1;
     const MCallSetProperty *mir() const {
         return mir_->toCallSetProperty();
     }
 };
 class LCallDeleteProperty : public LCallInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallDeleteProperty)
     static const size_t Value = 0;
     MDeleteProperty *mir() const {
         return mir_->toDeleteProperty();
     }
 };
 class LCallDeleteElement : public LCallInstructionHelper<1, 2 * BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(CallDeleteElement)
     static const size_t Value = 0;
     static const size_t Index = BOX_PIECES;
     MDeleteElement *mir() const {
         return mir_->toDeleteElement();
     }
 };
 // Patchable jump to stubs generated for a SetProperty cache, which stores a
 // boxed value.
 class LSetPropertyCacheV : public LInstructionHelper<0, 1 + BOX_PIECES, 2>
 {
   public:
     LIR_HEADER(SetPropertyCacheV)
     LSetPropertyCacheV(const LAllocation &object, const LDefinition &slots,
                        const LDefinition &temp) {
         setOperand(0, object);
         setTemp(0, slots);
         setTemp(1, temp);
     }
     static const size_t Value = 1;
     const MSetPropertyCache *mir() const {
         return mir_->toSetPropertyCache();
     }
     const LDefinition *tempForDispatchCache() {
         return getTemp(1);
     }
 };
 // Patchable jump to stubs generated for a SetProperty cache, which stores a
 // value of a known type.
 class LSetPropertyCacheT : public LInstructionHelper<0, 2, 2>
 {
     MIRType valueType_;
   public:
     LIR_HEADER(SetPropertyCacheT)
     LSetPropertyCacheT(const LAllocation &object, const LDefinition &slots,
                        const LAllocation &value, const LDefinition &temp,
                        MIRType valueType)
         : valueType_(valueType)
     {
         setOperand(0, object);
         setOperand(1, value);
         setTemp(0, slots);
         setTemp(1, temp);
     }
     const MSetPropertyCache *mir() const {
         return mir_->toSetPropertyCache();
     }
     MIRType valueType() {
         return valueType_;
     }
     const char *extraName() const {
         return StringFromMIRType(valueType_);
     }
     const LDefinition *tempForDispatchCache() {
         return getTemp(1);
     }
 };
 class LSetElementCacheV : public LInstructionHelper<0, 1 + 2 * BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(SetElementCacheV);
     static const size_t Index = 1;
     static const size_t Value = 1 + BOX_PIECES;
     LSetElementCacheV(const LAllocation &object, const LDefinition &tempToUnboxIndex,
                       const LDefinition &temp, const LDefinition &tempFloat)
     {
         setOperand(0, object);
         setTemp(0, tempToUnboxIndex);
         setTemp(1, temp);
         setTemp(2, tempFloat);
     }
     const MSetElementCache *mir() const {
         return mir_->toSetElementCache();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *tempToUnboxIndex() {
         return getTemp(0);
     }
     const LDefinition *temp() {
         return getTemp(1);
     }
     const LDefinition *tempFloat() {
         return getTemp(2);
     }
 };
 class LSetElementCacheT : public LInstructionHelper<0, 2 + BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(SetElementCacheT);
     static const size_t Index = 2;
     LSetElementCacheT(const LAllocation &object, const LAllocation &value,
                       const LDefinition &tempToUnboxIndex,
                       const LDefinition &temp, const LDefinition &tempFloat) {
         setOperand(0, object);
         setOperand(1, value);
         setTemp(0, tempToUnboxIndex);
         setTemp(1, temp);
         setTemp(2, tempFloat);
     }
     const MSetElementCache *mir() const {
         return mir_->toSetElementCache();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     const LDefinition *tempToUnboxIndex() {
         return getTemp(0);
     }
     const LDefinition *temp() {
         return getTemp(1);
     }
     const LDefinition *tempFloat() {
         return getTemp(2);
     }
 };
 class LCallIteratorStart : public LCallInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(CallIteratorStart)
     LCallIteratorStart(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     MIteratorStart *mir() const {
         return mir_->toIteratorStart();
     }
 };
 class LIteratorStart : public LInstructionHelper<1, 1, 3>
 {
   public:
     LIR_HEADER(IteratorStart)
     LIteratorStart(const LAllocation &object, const LDefinition &temp1,
                    const LDefinition &temp2, const LDefinition &temp3) {
         setOperand(0, object);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
     MIteratorStart *mir() const {
         return mir_->toIteratorStart();
     }
 };
 class LIteratorNext : public LInstructionHelper<BOX_PIECES, 1, 1>
 {
   public:
     LIR_HEADER(IteratorNext)
     LIteratorNext(const LAllocation &iterator, const LDefinition &temp) {
         setOperand(0, iterator);
         setTemp(0, temp);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MIteratorNext *mir() const {
         return mir_->toIteratorNext();
     }
 };
 class LIteratorMore : public LInstructionHelper<1, 1, 1>
 {
   public:
     LIR_HEADER(IteratorMore)
     LIteratorMore(const LAllocation &iterator, const LDefinition &temp) {
         setOperand(0, iterator);
         setTemp(0, temp);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MIteratorMore *mir() const {
         return mir_->toIteratorMore();
     }
 };
 class LIteratorEnd : public LInstructionHelper<0, 1, 3>
 {
   public:
     LIR_HEADER(IteratorEnd)
     LIteratorEnd(const LAllocation &iterator, const LDefinition &temp1,
                  const LDefinition &temp2, const LDefinition &temp3) {
         setOperand(0, iterator);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp1() {
         return getTemp(0);
     }
     const LDefinition *temp2() {
         return getTemp(1);
     }
     const LDefinition *temp3() {
         return getTemp(2);
     }
     MIteratorEnd *mir() const {
         return mir_->toIteratorEnd();
     }
 };
 // Read the number of actual arguments.
 class LArgumentsLength : public LInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(ArgumentsLength)
 };
 // Load a value from the actual arguments.
 class LGetFrameArgument : public LInstructionHelper<BOX_PIECES, 1, 0>
 {
   public:
     LIR_HEADER(GetFrameArgument)
     LGetFrameArgument(const LAllocation &index) {
         setOperand(0, index);
     }
     const LAllocation *index() {
         return getOperand(0);
     }
 };
 // Load a value from the actual arguments.
 class LSetFrameArgumentT : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(SetFrameArgumentT)
     LSetFrameArgumentT(const LAllocation &input) {
         setOperand(0, input);
     }
     MSetFrameArgument *mir() const {
         return mir_->toSetFrameArgument();
     }
     const LAllocation *input() {
         return getOperand(0);
     }
 };
 // Load a value from the actual arguments.
 class LSetFrameArgumentC : public LInstructionHelper<0, 0, 0>
 {
     Value val_;
   public:
     LIR_HEADER(SetFrameArgumentC)
     LSetFrameArgumentC(const Value &val) {
         val_ = val;
     }
     MSetFrameArgument *mir() const {
         return mir_->toSetFrameArgument();
     }
     const Value &val() const {
         return val_;
     }
 };
 // Load a value from the actual arguments.
 class LSetFrameArgumentV : public LInstructionHelper<0, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(SetFrameArgumentV)
     LSetFrameArgumentV() {}
     static const size_t Input = 0;
     MSetFrameArgument *mir() const {
         return mir_->toSetFrameArgument();
     }
 };
 class LRunOncePrologue : public LCallInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(RunOncePrologue)
     MRunOncePrologue *mir() const {
         return mir_->toRunOncePrologue();
     }
 };
 // Create the rest parameter.
 class LRest : public LCallInstructionHelper<1, 1, 3>
 {
   public:
     LIR_HEADER(Rest)
     LRest(const LAllocation &numActuals, const LDefinition &temp1, const LDefinition &temp2,
           const LDefinition &temp3)
     {
         setOperand(0, numActuals);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     const LAllocation *numActuals() {
         return getOperand(0);
     }
     MRest *mir() const {
         return mir_->toRest();
     }
 };
 class LRestPar : public LCallInstructionHelper<1, 2, 3>
 {
   public:
     LIR_HEADER(RestPar);
     LRestPar(const LAllocation &cx, const LAllocation &numActuals,
              const LDefinition &temp1, const LDefinition &temp2, const LDefinition &temp3)
     {
         setOperand(0, cx);
         setOperand(1, numActuals);
         setTemp(0, temp1);
         setTemp(1, temp2);
         setTemp(2, temp3);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LAllocation *numActuals() {
         return getOperand(1);
     }
     MRestPar *mir() const {
         return mir_->toRestPar();
     }
 };
 class LGuardThreadExclusive : public LCallInstructionHelper<0, 2, 1>
 {
   public:
     LIR_HEADER(GuardThreadExclusive);
     LGuardThreadExclusive(const LAllocation &cx, const LAllocation &object, const LDefinition &temp1) {
         setOperand(0, cx);
         setOperand(1, object);
         setTemp(0, temp1);
     }
     const LAllocation *forkJoinContext() {
         return getOperand(0);
     }
     const LAllocation *object() {
         return getOperand(1);
     }
     const LDefinition *getTempReg() {
         return getTemp(0);
     }
 };
 // Guard that a value is in a TypeSet.
 class LTypeBarrierV : public LInstructionHelper<0, BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(TypeBarrierV)
     LTypeBarrierV(const LDefinition &temp) {
         setTemp(0, temp);
     }
     static const size_t Input = 0;
     const MTypeBarrier *mir() const {
         return mir_->toTypeBarrier();
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Guard that a object is in a TypeSet.
 class LTypeBarrierO : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(TypeBarrierO)
     LTypeBarrierO(const LAllocation &obj, const LDefinition &temp) {
         setOperand(0, obj);
         setTemp(0, temp);
     }
     const MTypeBarrier *mir() const {
         return mir_->toTypeBarrier();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Guard that a value is in a TypeSet.
 class LMonitorTypes : public LInstructionHelper<0, BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(MonitorTypes)
     LMonitorTypes(const LDefinition &temp) {
         setTemp(0, temp);
     }
     static const size_t Input = 0;
     const MMonitorTypes *mir() const {
         return mir_->toMonitorTypes();
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Generational write barrier used when writing an object to another object.
 class LPostWriteBarrierO : public LInstructionHelper<0, 2, 1>
 {
   public:
     LIR_HEADER(PostWriteBarrierO)
     LPostWriteBarrierO(const LAllocation &obj, const LAllocation &value,
                        const LDefinition &temp) {
         setOperand(0, obj);
         setOperand(1, value);
         setTemp(0, temp);
     }
     const MPostWriteBarrier *mir() const {
         return mir_->toPostWriteBarrier();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Generational write barrier used when writing a value to another object.
 class LPostWriteBarrierV : public LInstructionHelper<0, 1 + BOX_PIECES, 1>
 {
   public:
     LIR_HEADER(PostWriteBarrierV)
     LPostWriteBarrierV(const LAllocation &obj, const LDefinition &temp) {
         setOperand(0, obj);
         setTemp(0, temp);
     }
     static const size_t Input = 1;
     const MPostWriteBarrier *mir() const {
         return mir_->toPostWriteBarrier();
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
 };
 // Guard against an object's identity.
 class LGuardObjectIdentity : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(GuardObjectIdentity)
     LGuardObjectIdentity(const LAllocation &in) {
         setOperand(0, in);
     }
     const MGuardObjectIdentity *mir() const {
         return mir_->toGuardObjectIdentity();
     }
 };
 // Guard against an object's class.
 class LGuardClass : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(GuardClass)
     LGuardClass(const LAllocation &in, const LDefinition &temp) {
         setOperand(0, in);
         setTemp(0, temp);
     }
     const MGuardClass *mir() const {
         return mir_->toGuardClass();
     }
     const LDefinition *tempInt() {
         return getTemp(0);
     }
 };
 class MPhi;
 // Phi is a pseudo-instruction that emits no code, and is an annotation for the
 // register allocator. Like its equivalent in MIR, phis are collected at the
 // top of blocks and are meant to be executed in parallel, choosing the input
 // corresponding to the predecessor taken in the control flow graph.
 class LPhi MOZ_FINAL : public LInstruction
 {
     LAllocation *inputs_;
     LDefinition def_;
     LPhi()
     { }
   public:
     LIR_HEADER(Phi)
     static LPhi *New(MIRGenerator *gen, MPhi *phi);
     size_t numDefs() const {
         return 1;
     }
     LDefinition *getDef(size_t index) {
         JS_ASSERT(index == 0);
         return &def_;
     }
     void setDef(size_t index, const LDefinition &def) {
         JS_ASSERT(index == 0);
         def_ = def;
     }
     size_t numOperands() const {
         return mir_->toPhi()->numOperands();
     }
     LAllocation *getOperand(size_t index) {
         JS_ASSERT(index < numOperands());
         return &inputs_[index];
     }
     void setOperand(size_t index, const LAllocation &a) {
         JS_ASSERT(index < numOperands());
         inputs_[index] = a;
     }
     size_t numTemps() const {
         return 0;
     }
     LDefinition *getTemp(size_t index) {
         MOZ_ASSUME_UNREACHABLE("no temps");
     }
     void setTemp(size_t index, const LDefinition &temp) {
         MOZ_ASSUME_UNREACHABLE("no temps");
     }
     size_t numSuccessors() const {
         return 0;
     }
     MBasicBlock *getSuccessor(size_t i) const {
         MOZ_ASSUME_UNREACHABLE("no successors");
     }
     void setSuccessor(size_t i, MBasicBlock *) {
         MOZ_ASSUME_UNREACHABLE("no successors");
     }
     virtual void printInfo(FILE *fp) {
         printOperands(fp);
     }
 };
 class LIn : public LCallInstructionHelper<1, BOX_PIECES+1, 0>
 {
   public:
     LIR_HEADER(In)
     LIn(const LAllocation &rhs) {
         setOperand(RHS, rhs);
     }
     const LAllocation *lhs() {
         return getOperand(LHS);
     }
     const LAllocation *rhs() {
         return getOperand(RHS);
     }
     static const size_t LHS = 0;
     static const size_t RHS = BOX_PIECES;
 };
 class LInstanceOfO : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(InstanceOfO)
     LInstanceOfO(const LAllocation &lhs) {
         setOperand(0, lhs);
     }
     MInstanceOf *mir() const {
         return mir_->toInstanceOf();
     }
     const LAllocation *lhs() {
         return getOperand(0);
     }
 };
 class LInstanceOfV : public LInstructionHelper<1, BOX_PIECES, 0>
 {
   public:
     LIR_HEADER(InstanceOfV)
     LInstanceOfV() {
     }
     MInstanceOf *mir() const {
         return mir_->toInstanceOf();
     }
     const LAllocation *lhs() {
         return getOperand(LHS);
     }
     static const size_t LHS = 0;
 };
 class LCallInstanceOf : public LCallInstructionHelper<1, BOX_PIECES+1, 0>
 {
   public:
     LIR_HEADER(CallInstanceOf)
     LCallInstanceOf(const LAllocation &rhs) {
         setOperand(RHS, rhs);
     }
     const LDefinition *output() {
         return this->getDef(0);
     }
     const LAllocation *lhs() {
         return getOperand(LHS);
     }
     const LAllocation *rhs() {
         return getOperand(RHS);
     }
     static const size_t LHS = 0;
     static const size_t RHS = BOX_PIECES;
 };
 class LProfilerStackOp : public LInstructionHelper<0, 0, 1>
 {
   public:
     LIR_HEADER(ProfilerStackOp)
     LProfilerStackOp(const LDefinition &temp) {
         setTemp(0, temp);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     JSScript *script() {
         return mir_->toProfilerStackOp()->script();
     }
     MProfilerStackOp::Type type() {
         return mir_->toProfilerStackOp()->type();
     }
     unsigned inlineLevel() {
         return mir_->toProfilerStackOp()->inlineLevel();
     }
 };
 class LIsCallable : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(IsCallable);
     LIsCallable(const LAllocation &object) {
         setOperand(0, object);
     }
     const LAllocation *object() {
         return getOperand(0);
     }
     MIsCallable *mir() const {
         return mir_->toIsCallable();
     }
 };
 class LHaveSameClass : public LInstructionHelper<1, 2, 1>
 {
   public:
     LIR_HEADER(HaveSameClass);
     LHaveSameClass(const LAllocation &left, const LAllocation &right,
                    const LDefinition &temp) {
         setOperand(0, left);
         setOperand(1, right);
         setTemp(0, temp);
     }
     const LAllocation *lhs() {
         return getOperand(0);
     }
     const LAllocation *rhs() {
         return getOperand(1);
     }
     MHaveSameClass *mir() const {
         return mir_->toHaveSameClass();
     }
 };
 class LHasClass : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(HasClass);
     LHasClass(const LAllocation &lhs) {
         setOperand(0, lhs);
     }
     const LAllocation *lhs() {
         return getOperand(0);
     }
     MHasClass *mir() const {
         return mir_->toHasClass();
     }
 };
 class LAsmJSLoadHeap : public LInstructionHelper<1, 1, 0>
 {
   public:
     LIR_HEADER(AsmJSLoadHeap);
     LAsmJSLoadHeap(const LAllocation &ptr) {
         setOperand(0, ptr);
     }
     MAsmJSLoadHeap *mir() const {
         return mir_->toAsmJSLoadHeap();
     }
     const LAllocation *ptr() {
         return getOperand(0);
     }
 };
 class LAsmJSStoreHeap : public LInstructionHelper<0, 2, 0>
 {
   public:
     LIR_HEADER(AsmJSStoreHeap);
     LAsmJSStoreHeap(const LAllocation &ptr, const LAllocation &value) {
         setOperand(0, ptr);
         setOperand(1, value);
     }
     MAsmJSStoreHeap *mir() const {
         return mir_->toAsmJSStoreHeap();
     }
     const LAllocation *ptr() {
         return getOperand(0);
     }
     const LAllocation *value() {
         return getOperand(1);
     }
 };
 class LAsmJSLoadGlobalVar : public LInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(AsmJSLoadGlobalVar);
     MAsmJSLoadGlobalVar *mir() const {
         return mir_->toAsmJSLoadGlobalVar();
     }
 };
 class LAsmJSStoreGlobalVar : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(AsmJSStoreGlobalVar);
     LAsmJSStoreGlobalVar(const LAllocation &value) {
         setOperand(0, value);
     }
     MAsmJSStoreGlobalVar *mir() const {
         return mir_->toAsmJSStoreGlobalVar();
     }
     const LAllocation *value() {
         return getOperand(0);
     }
 };
 class LAsmJSLoadFFIFunc : public LInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(AsmJSLoadFFIFunc);
     MAsmJSLoadFFIFunc *mir() const {
         return mir_->toAsmJSLoadFFIFunc();
     }
 };
 class LAsmJSParameter : public LInstructionHelper<1, 0, 0>
 {
   public:
     LIR_HEADER(AsmJSParameter);
 };
 class LAsmJSReturn : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(AsmJSReturn);
 };
 class LAsmJSVoidReturn : public LInstructionHelper<0, 0, 0>
 {
   public:
     LIR_HEADER(AsmJSVoidReturn);
 };
 class LAsmJSPassStackArg : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(AsmJSPassStackArg);
     LAsmJSPassStackArg(const LAllocation &arg) {
         setOperand(0, arg);
     }
     MAsmJSPassStackArg *mir() const {
         return mirRaw()->toAsmJSPassStackArg();
     }
     const LAllocation *arg() {
         return getOperand(0);
     }
 };
 class LAsmJSCall MOZ_FINAL : public LInstruction
 {
     LAllocation *operands_;
     uint32_t numOperands_;
     LDefinition def_;
   public:
     LIR_HEADER(AsmJSCall);
     LAsmJSCall(LAllocation *operands, uint32_t numOperands)
       : operands_(operands),
         numOperands_(numOperands),
         def_(LDefinition::BogusTemp())
     {}
     MAsmJSCall *mir() const {
         return mir_->toAsmJSCall();
     }
     bool isCall() const {
         return true;
     }
     // LInstruction interface
     size_t numDefs() const {
         return def_.isBogusTemp() ? 0 : 1;
     }
     LDefinition *getDef(size_t index) {
         JS_ASSERT(numDefs() == 1);
         JS_ASSERT(index == 0);
         return &def_;
     }
     void setDef(size_t index, const LDefinition &def) {
         JS_ASSERT(index == 0);
         def_ = def;
     }
     size_t numOperands() const {
         return numOperands_;
     }
     LAllocation *getOperand(size_t index) {
         JS_ASSERT(index < numOperands_);
         return &operands_[index];
     }
     void setOperand(size_t index, const LAllocation &a) {
         JS_ASSERT(index < numOperands_);
         operands_[index] = a;
     }
     size_t numTemps() const {
         return 0;
     }
     LDefinition *getTemp(size_t index) {
         MOZ_ASSUME_UNREACHABLE("no temps");
     }
     void setTemp(size_t index, const LDefinition &a) {
         MOZ_ASSUME_UNREACHABLE("no temps");
     }
     size_t numSuccessors() const {
         return 0;
     }
     MBasicBlock *getSuccessor(size_t i) const {
         MOZ_ASSUME_UNREACHABLE("no successors");
     }
     void setSuccessor(size_t i, MBasicBlock *) {
         MOZ_ASSUME_UNREACHABLE("no successors");
     }
 };
 class LAssertRangeI : public LInstructionHelper<0, 1, 0>
 {
   public:
     LIR_HEADER(AssertRangeI)
     LAssertRangeI(const LAllocation &input) {
         setOperand(0, input);
     }
     const LAllocation *input() {
         return getOperand(0);
     }
     MAssertRange *mir() {
         return mir_->toAssertRange();
     }
     const Range *range() {
         return mir()->assertedRange();
     }
 };
 class LAssertRangeD : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(AssertRangeD)
     LAssertRangeD(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LAllocation *input() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MAssertRange *mir() {
         return mir_->toAssertRange();
     }
     const Range *range() {
         return mir()->assertedRange();
     }
 };
 class LAssertRangeF : public LInstructionHelper<0, 1, 1>
 {
   public:
     LIR_HEADER(AssertRangeF)
     LAssertRangeF(const LAllocation &input, const LDefinition &temp) {
         setOperand(0, input);
         setTemp(0, temp);
     }
     const LAllocation *input() {
         return getOperand(0);
     }
     const LDefinition *temp() {
         return getTemp(0);
     }
     MAssertRange *mir() {
         return mir_->toAssertRange();
     }
     const Range *range() {
         return mir()->assertedRange();
     }
 };
 class LAssertRangeV : public LInstructionHelper<0, BOX_PIECES, 3>
 {
   public:
     LIR_HEADER(AssertRangeV)
     LAssertRangeV(const LDefinition &temp, const LDefinition &floatTemp1,
                   const LDefinition &floatTemp2)
     {
         setTemp(0, temp);
         setTemp(1, floatTemp1);
         setTemp(2, floatTemp2);
     }
     static const size_t Input = 0;
     const LDefinition *temp() {
         return getTemp(0);
     }
     const LDefinition *floatTemp1() {
         return getTemp(1);
     }
     const LDefinition *floatTemp2() {
         return getTemp(2);
     }
     MAssertRange *mir() {
         return mir_->toAssertRange();
     }
     const Range *range() {
         return mir()->assertedRange();
     }
 };
 class LRecompileCheck : public LInstructionHelper<0, 0, 1>
 {
   public:
     LIR_HEADER(RecompileCheck)
     LRecompileCheck(const LDefinition &scratch) {
         setTemp(0, scratch);
     }
     const LDefinition *scratch() {
         return getTemp(0);
     }
     MRecompileCheck *mir() {
         return mir_->toRecompileCheck();
     }
 };
 } // namespace jit
 } // namespace js
 #endif /* jit_LIR_Common_h */

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js/src/jit/LIR-Common.h@6474c204b198 (annotated)

js/src/jit/LIR-Common.h